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Question
Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Expiration is normally brought about by the relaxation of inspiratory muscles.
(ii) Oxyhaemoglobin can hold much less carbon dioxide in the form of carbaminohaemoglobin than what deoxyhaemoglobincan.
(iii) A person can expel air the air from the lungs by a forceful expiration.
(iv) A rise in PCO2 increases the oxygen - affinity of haemoglobin.
Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F).
(i) Expiration is normally brought about by the relaxation of inspiratory muscles.
(ii) Oxyhaemoglobin can hold much less carbon dioxide in the form of carbaminohaemoglobin than what deoxyhaemoglobincan.
(iii) A person can expel air the air from the lungs by a forceful expiration.
(iv) A rise in PCO2 increases the oxygen - affinity of haemoglobin.
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Solution
The correct option is B (i)T (ii)T(iii)F(iv)F
A person cannot expel all the air from the lungs even after forceful expiration. The volume of air which remains in the lungs after the most forceful expiration is called residual volume, it is about 1100 mL to 1200 mL A rise in PCO2 decreases the O2 affinity of haemoglobin.
A person cannot expel all the air from the lungs even after forceful expiration. The volume of air which remains in the lungs after the most forceful expiration is called residual volume, it is about 1100 mL to 1200 mL A rise in PCO2 decreases the O2 affinity of haemoglobin.
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