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Objectives
•Answer your questions•Review chapter 14: Respiratory System•Chapter 15: Digestive System
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Types of Respiration
•Pulmonary ventilation: breathing or external respiration
•Internal respiration: exchange of gasses between the blood and cells of the body
•Cellular respiration: use of oxygen by cells in the process of metabolism
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What is the function of respiration?•Air distribution
▫Supply oxygen to cells and remove carbon dioxide from cells
•Gas exchange•Warms, filters and humidifies the air we
breathe
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Structure of Respiratory System•Tube with many branches ending in
millions of extremely tiny, very thin-walled sacs▫What are these sacs called?
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Structure of Respiratory System•Tube with many branches ending in
millions of extremely tiny, very thin-walled sacs▫What are these sacs called?
Alveoli•The alveoli distribute air close enough to
blood for a gas exchange to take place between air and blood. ▫What is this transport process called?
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Structure of Respiratory System•Tube with many branches ending in
millions of extremely tiny, very thin-walled sacs▫What are these sacs called?
Alveoli•The alveoli distribute air close enough to
blood for a gas exchange to take place between air and blood. ▫What is this transport process called?
Diffusion
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Upper Respiratory Tract•Nose
▫External nares▫Nasal cavities
•Pharynx▫Nasopharynx▫Oropharynx▫Laryngoharynx
•Larynx (voice box)▫Vocal cords▫Glottis▫Epiglotttis ▫Thyroid cartilage
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Lower Respiratory Tract•Trachea (windpipe)
▫15-20 C-shaped rings of cartilage
▫Produces and moves mucus up to the pharynx
•Bronchial tree▫Primary (right and left)
bronchi•Lungs
▫Secondary bronchi▫Bronchioles▫Alveolar ducts▫Alveolar sacs▫Alveoli
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InspirationDiaphragm 1_____________, volume of thorax 2_______________ and pressure 3 ____________, causing air to fill the lungs.
ExpirationDiaphragm returns to 4_____________, volume of thorax 5_______________ and pressure 6____________, forcing air from the lungs.
InspirationDiaphragm contracts, volume of thorax increases and pressure decreases, causing air to fill the lungs.
ExpirationDiaphragm returns to upward position, volume of thorax decreases and pressure increases, forcing air from the lungs.
Pulmonary Stretch Receptors
•Respond to stretch in lungs•Protects respiratory organs from over
inflation•Air inspired – lungs expand, stimulating
the stretch receptors to inhibit inspiration – relaxation of inspiratory muscles occurs – expiration follows
•Air expired – lungs deflate, inhibiting the stretch receptors – inspiration allowed to start again
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What is the function of the respiratory mucosa?•It is different from the respiratory
membrane and serves a different purpose.▫Respiratory membrane: separates the air
in the alveoli from the blood in surrounding capillaries
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What is the function of the respiratory mucosa?•Respiratory Mucosa
▫Covered with mucus▫Lines the tubes of the respiratory tree▫Cleanses the air by trapping bacteria▫Mucus forms a “blanket” that moves
contaminants upward to the pharynx with the help of the hairline cilia that line the respiratory mucosa
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Digestive System (Alimentary Canal)
•29 feet long•Two types of digestion
▫1. mechanical Chewing or deglutition Churning of stomach Defecation
▫2. chemical Digestive enzymes and other chemicals
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What are the three kinds of processing that food undergo in the body?•Digestion•Absorption•Metabolism
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What are the four layers of the digestive tract?1. Mucosa or mucous membrane2. Submucosa3. Muscularis4. Serosa
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Salivary Glands
•Parotid gland: largest salivary gland, lies just below and in front of each ear at the angle of the jaw
•Submandibular glands: open on either side of the lingual frenulum
•Sublingual glands: open into the floor of the mouth
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Digestion•Carbohydrate
▫Salivary amylase in mouth▫Pancreatic and intestinal juice enzymes
digest starches and sugars•Protein
▫Pepsin in stomach▫Trypsin and peptidases in small intestine
•Fat▫Emulsification by bile in the duodenum▫Pancreatic lipase splits up fat into fatty
acids and glycerol
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Digestion-Let’s Practice
•Where does digestion of carbohydrate begin?
•Where does digestion of protein begin?•Where does digestion of fat begin?
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Digestion-Let’s Practice•Where does digestion of carbohydrate
begin?▫In the mouth with salivary amylase▫The majority takes place in the duodenum
with intestinal enzymes sucrase, maltase and lactase
•Where does digestion of protein begin?▫In the stomach with gastric juice containing
pepsin and HCl▫It continues in the small intestine with
trypsin & peptidases•Where does digestion of fat begin?
▫In the duodenum with pancreatic juice containing lipase
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What are the three divisions of the stomach?•1. fundus: enlarged portion to the left of
and above the opening of the esophagus in to the stomach
•2. body: central part of the stomach•3. pylorus: lower narrow section, which
joins the first part of the small intestine
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Pancreas
•Both an exocrine and endocrine gland•Exocrine
▫Secretes pancreatic juice into ducts•Endocrine
▫Secretes hormones into the blood
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Large Intestine
•What are the subdivisions of the large intestine?▫Cecum▫Ascending colon▫Transverse colon▫Descending colon▫Sigmoid colon▫Rectum▫Anal canal
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Slide 42
A function of respiratory organs is to
A. Maintain stable CO2 concentration in the bodyB. Maintain stable O2 concentration in the body
C. Distribute air to the lungsD. Warm and humidify breathed airE. All of the above are correct
Slide 43
After leaving the trachea during inspiration, air then moves into the
A. Primary bronchiB. Secondary bronchiC. LarynxD. PharynxE. Alveoli
Slide 45As a person begins exercising,we should expect theirtidal volume to ? over time.
A. IncreaseB. Decrease
Slide 46
Chemoreceptors detect an increase of CO2 in the blood. What will happen next?
A. Rate of breathing increasesB. Rate of breathing decreasesC. No change in rate of breathing
Slide 48
After material leaves the stomach, it then enters the
A. ColonB. JejunumC. DuodenumD. IleumE. Esophagus
Slide 49
Proteins are digested into ? and then absorbed.
A. MonosaccharidesB. DisaccharidesC. Peptide groupsD. Amino acidsE. Fatty acids
Slide 51
Most nutrients are absorbed through the wall of the
A. StomachB. ColonC. Small intestineD. LiverE. Pancreas
AnimationsTo help you study for unit 6 exam•1. Respiratory mucosa•2. Mouth and Initiation of Mechanical
Digestion•3. Pharynx•4. Small Intestine
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Farewell•Thank you for your kind attention and
participation!•Email any time [email protected]•Call if your matter is urgent
▫630 323 3307•Follow me on Twitter
▫@ProfAmyH
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