EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Higher concentration of carbon dioxide (CO2) and a lower concentration of oxygen (O2)
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Higher concentration of oxygen (O2) and a lower concentration of carbon dioxide (CO2)
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Either A or B
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None of the above
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Detailed explanation-1: -The air in the lungs has a higher concentration of oxygen than that of oxygen-depleted blood and a lower concentration of carbon dioxide. This concentration gradient allows for gas exchange during respiration. Partial pressure is a measure of the concentration of the individual components in a mixture of gases.
Detailed explanation-2: -Like tree branches, bronchioles divide into thousands of even smaller passages. At the end of each bronchiole is a cluster of little air sacs called alveoli. Alveoli are wrapped in tiny blood vessels called capillaries. The air you breathe in fills these air sacs with oxygen-rich air.
Detailed explanation-3: -A low alveolar oxygen tension increases pulmonary vascular resistance (hypoxic pulmonary vasoconstriction), and a high alveolar oxygen tension decreases pulmonary vascular resistance.