Whether oxygen diffuses from the alveoli into the blood or not is dependent upon the partial pressure of _______________.
oxygen in the lungs and in the blood
oxygen in the lungs only
oxygen and carbon dioxide in the blood
all gases in the atmosphere and blood
Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and the diaphragm is raised.
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air.
(iii) Haemoglobin has a greater affinity for carbon dioxide than oxygen.
(iv) Alveoli increase surface area for exchange of gases.
(a) (i) and (iv)
(b) (ii) and(iii)
(c) (i) and (iii)
(d) (ii) and (iv)