Question

Consider for following four statements and select the correct option starting which ones are true `(T)` and which ones are flase (F).
(i) Expiration is normally brough about by the relaxation of inspiratory muscles.
(ii) Oxyhaemoglobin can hold much less carbon dioxide in the form of carbaminohaemoglobin than what deoxyhaemoglobin can.
(iii) A person can expel all the air from the lungs by a forceful expiration.
(iv) A rise in `PCO_(2)` increases the oxygen-affinity of haemoglobin.
A. `{:("(i)",(ii),(iii),(iv)),(F,F,T,F):}`
B. `{:("(i)"1,(ii),(iii),(iv)),(T,T,F,F):}`
C. `{:("(i)",(ii),(iii),(iv)),(F,T,T,F):}`
D. `{:("(i)",(ii),(iii),(iv)),(T,T,T,F):}`

Answer 1

Correct Answer - B
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 `PCO_(2)` decreases the `O_(2)` affinity of haemoglobin.