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3.4.1 Homeostasis3.4.2 Necessity for Homeostasis
3.4.3 The Structure of an Exchange System in Flowering Plants
3.4.4 The Breathing System in the Human
Follow-Me – iQuiz
Q. What is homeostasis?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Note one reason why homeostasis is important in the human body.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. What is the function of the stomata of the leaf?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name the structures in plant cells in which photosynthesis occurs.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name a gas that leaves the leaf at the stoma(ta).
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. How do the nephrons of the kidneys contribute to homeostasis?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name a factor that influences the diameter of the stoma(ta).
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Give a function of the guard cell.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Where do cilia occur in the breathing system?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. State precisely the events that take place in the alveoli.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. State the function of the epiglottis.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name the process involved in the passage of gas between the alveolus and the blood.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. How does the liver contribute to homeostasis?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name the apertures in stems that are equivalent to stomata.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name the process by which the gases move in or out of the leaf.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. What is the function of cilia in the trachea?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. In the spongy mesophyll, gases can diffuse throughout the leaf. Name one such gas.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Tiny holes called ... allow gases to enter and leave the leaf.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. How do the lungs contribute to homeostasis?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. How are alveoli adapted for their purpose?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Name the main gas transported in the pulmonary vein.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. How is oxygen transported in the blood?
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. State the function of the larynx.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
Please CLICK on THIS BOX
for the Next Question
Q. Describe the role of the diaphragm in inhalation.
Absorption or release of glucose; Heat generation
Allows normal metabolic activities; Keeps temperature suitable for enzyme reactions
Close off trachea
Chloroplasts
Capillary network; Moist surface; Thin walled; Elastic wall; Large
surface area; One cell thick
Diffusion
Controls stomatal size; Controls passage of gases
Contracts, lowers and increases volume of thorax
CO2; Light intensity; Potassium ions; Water
Excretion of water or CO2; Release of heat
Lenticels
Make sound
Osmosis
Oxygen
Exchange of gases – CO2 out, O2 in by diffusion
Trachea
Stomata
Oxygen; Water vapour; Carbon dioxide; Nitrogen
Their motion carries trapped dirt particles and bacteria
upwards to the glottis
Air; Water vapour; O2; CO2; N2
Excretion or reabsorption of water; Excretion of salts;
Reabsorption of salts
Allow exchange of gases; Transpiration
Maintaining a constant internal environment
By oxyhaemoglobin
CONGRATULATIONS
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