Question

The graph below shows changes in air pressure
in the lungs of a person during respiration
762
H
Atmospheric pressure=760 mmHg
Air pressure
in the lungs 760
(mm Hg)
- Time
T
R.
P
S
758 +
How many of the following statements are true
regarding this?
(0) The region between P to R indicates
exhalation.
The region between R to T indicates
inhalation.
(iii) At S, the rib cage is downward and inward
and shape of the diaphragm is dome shaped.
(iv) At Q the volume of thoracic cavity
increases.​

Answer 1

Answer:

3rd one is correct

Explanation:

(iii) At S, the rib cage is downward and inward

and shape of the diaphragm is dome shaped.