1. Physiology of the Respiratory System

2. Respiratory Physiology
Pulmonary Ventilation = breathing
Mechanism
___________________________________________________
When atmospheric pressure (760 mmHg) is greater than lung pressure ---- air flows in = _________.
When lung pressure is greater than atmospheric pressure air flows out = ___________.

3. Respiratory Physiology
Pressure gradients are established by changes in thoracic cavity.
______________= a decrease in pressure --- air moves in.
______________= increase in pressure --- air moves out.

5. Inspiration
-___________________________________________________

6. Expiration
________________________________________________

7. Circulation and Gas Exchange
Recall the interconnection between circulation and the respiratory system.
Gas exchange at the lungs and in the body cells moves oxygen into cells and carbon dioxide out.

9. Volumes of Air Exchange
____________- amount of air exhaled normally after a typical inspiration. Normal - about 500 ml
Expiratory Reserve volume - _______________________________________________(1 – 1.2 L).
_______________- (deep breath) amount of air that can be forcibly inhaled over and above normal. (3 L)

10. Volumes of Air Exchange
Residual volume - ______________________________________________(about 1.2 liters).
________________________– amount of air remaining in the lungs after the expiration of a normal breath at rest (2.3 liters)

11. Volumes of Air Exchange
Vital capacity - _________________________________________________. (4.6 L)
Vital capacity = ____________
______________maximu amoiunt of air the lungs can hold (5.8 L)
_____________

13. Volumes of Air Exchange
________ - normal quiet breathing, breaths per minute.
Hyperpnea - increase in breathing to meet an increased demand by body for oxygen.
Hyperventilation - increase in pulmonary ventilation in excess of the need for oxygen.
_____________ - decrease in pulmonary ventilation.
____________ - temporary cessation of breathing at the end of normal expiration.