Lecture 5- Respiration BSC2011L
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7 Terms
The human breathing system
Bronchiole ending in alveolar sacs & alveoli
Capillaries are extremely thin which allow oxygen to diffuse into the blood. (thin and fragile)
What is breathing controlled by?
Body motion and blood O2.
Blood O2 partial pressure also controls ventilation, but it is not as influential as CO2.
What two peripheral sensors monitor O2
The carotid and aortic bodies in the blood vessels leaving the heart
Mammalian lungs
Suspended in a thoracic cavity.
Inhalation
Contraction of the diaphragm expands the thoracic cavity, which pulls on the lungs and expands them; air is sucked in.
Exhalation:
The diaphragm and intercostal muscles relax, allowing elastic recoil of the lungs and thoracic cavity to push air out.
