HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Concentration gradient allows partial pressure of blood to change
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Concentration gradient allows blood to diffuse between high o2 lungs and low o2 blood
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Blood diffuses from areas of of high pressure to areas of low pressure
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Blood diffuses from areas of of high concentration to areas of low concentration
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Detailed explanation-1: -As mentioned above, a greater partial pressure of oxygen in the alveoli causes the pulmonary arterioles to dilate, increasing blood flow.
Detailed explanation-2: -The change in partial pressure from the alveoli (high concentration) to the capillaries (low concentration) drives the oxygen into the tissue and the carbon dioxide into the blood (high concentration) from the tissues (low concentration), which is then returned to the lungs and exhaled.
Detailed explanation-3: -The increase in CO2 concentration in the blood increases the rate of breathing. This increase in CO2 brings about a good change in the pH of the blood. This change could be detected by chemoreceptors of the medulla oblongata of the hindbrain which is also a regulatory centre for respiration.
Detailed explanation-4: -hyperventilation, sustained abnormal increase in breathing. During hyperventilation the rate of removal of carbon dioxide from the blood is increased. As the partial pressure of carbon dioxide in the blood decreases, respiratory alkalosis, characterized by decreased acidity or increased alkalinity of the blood, ensues.