View
224
Download
0
Category
Tags:
Preview:
Citation preview
Respiratory System&
Gas Exchange
Lungs
• Central Organ of the Respiratory System
• 2 compartments connect outside environment through the trachea
• Keeps “external” air separate from internal environment
Alveoli
• Tiny air sacs in the lungs
• Increase surface area of lungs
• Surrounded by capillaries
• Responsible for GAS exchange
Oxygen
• Once O2 is absorbed into the blood, it binds to Hemoglobin
• Hemoglobin– Protein found in Red Blood Cells– Delivers oxygen to body
Breathing Process
1. Air passes through nose- Moistened- Warmed- Cleaned
2. Pharynx
3. Larynx
4. Trachea
5. Bronchial tubes - One in each lung
Breathing Process
6. Bronchioles
7. Alveoli
8. Oxygen diffuses across alveolar membranes (thin walls) into capillaries
9. CO2 diffuses from capillaries into alveoli
Circulatory/Respiratory System Cooperation
• Allow oxygen to enter the blood/body without jeopardizing the health of the cells
• Keeps deep body cells away (safe) from external environment
Feedback Systems
• Necessary to retain Homeostasis
• Involve all 3 systems discussed– Respiratory– Circulatory– Nervous
F.S. Example
Breathing Rate During Exercise
1. Processes in body speed up
2. Production of CO2 increases
3. CO2 causes the blood to become more acidic
F.S. Example
Breathing Rate During Exercise
4. Nerve cells detect acidity
5. Cells send signal to respiratory centers of the brain
6. Respiratory centers respond by stimulating the diaphragm and rib muscles to contract more rapidly
F.S. Example
Breathing Rate During Exercise
7. Breathing rate is increased
8. Increases rate O2 brought into body and the rate at which CO2 is released
9. Blood becomes less acidic
F.S. Example
Breathing Rate During Exercise
10.Sensory receptors detect pH change
11. Info is relayed to respiratory centers in the brain
12.Brain signals diaphragm and rib muscles to slow contraction
F.S. Example
• Automatic response– You don’t have to think about your breathing
rate!
• Regulates the acidity of the blood!
Recommended