Question

a) Read the following statements :
A) Mammalian lungs are solid and spongy
B) In embryo state breathing rate and residual air are absent C) Residual volume is expelled only by force full expiration D) Partial pressure of oxygen in expired air is more than in inspired air How many statements are correct ?
(1). 3. (2). 4
(3). 2. (4). 1

b) Which are the correct ones?

If you know the answer then only answer.... no spam.... I'll report otherwise.. ​

Answer 1

A) Mammalian lungs are not solid rather they are soft and they are filled with alveoli...but they are spongy...

THIS IS INCORRECT

B) In embryo breathing rate and residual rate are absent because HB of the foetus is attached to the placenta of the mother. So there is no need of breathing.and the alveoli are sticked together

THIS IS CORRECT

C) residual volume can never be expelled...it is only the expiratory reserve volume expelled out through forceful expiration....if there is no residual volume inside our lungs ...vacuum is created and lungs will collapse..

THIS IS INCORRECT

D) The partial pressure of oxygen in maximum in the expired air (116 mm Hg) because during expiration the oxygen that could not be inhaled also moves out, contributing to more partial pressure in exhaled air.

A. Alveolar air has 104 mm Hg of partial pressure of oxygen.

B. Arterial blood has 95 mm Hg partial pressure of oxygen.

C. Venous blood has 40 mm Hg partial pressure of oxygen.

D. Expired air has 116 mm Hg partial pressure of oxygen.

THIS IS CORRECT

So the correct option is (3)