Lecture 5- Respiration BSC2011L

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Last updated 1:04 PM on 3/16/26
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7 Terms

1
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The human breathing system

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2
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Bronchiole ending in alveolar sacs & alveoli

Capillaries are extremely thin which allow oxygen to diffuse into the blood. (thin and fragile)

<p>Capillaries are extremely thin which allow oxygen to diffuse into the blood. (thin and fragile)</p>
3
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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.

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What two peripheral sensors monitor O2

The carotid and aortic bodies in the blood vessels leaving the heart

5
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Mammalian lungs

Suspended in a thoracic cavity.

6
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Inhalation

Contraction of the diaphragm expands the thoracic cavity, which pulls on the lungs and expands them; air is sucked in.

<p>Contraction of the diaphragm expands the thoracic cavity, which pulls on the lungs and expands them; air is sucked in. </p>
7
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Exhalation:

The diaphragm and intercostal muscles relax, allowing elastic recoil of the lungs and thoracic cavity to push air out.