levels.

iii. Arterial pH falls for mild to moderate exercise.

iv. On exercise increase in ventilation closely matches the increase in 02 uptake and
co, output.

A:-Only i and ii

B:-Only i and iv

D:-Only ii and iv

Correct Answer:- Option-D

Question64:-Which of the following statement is/are true about peripheral
chemoreceptors ?

i. The sensitivity of peripheral chemoreceptors to changes in arterial 70, begins
around 500 mm of Hg.

ii. Response of peripheral chemoreceptors to arterial 202 is much less important than
that of central chemoreceptors.

iii. Inhibition of ca2+ channels leads to depolarization of glomus cells.

iv. In humans, the carotid but not aortic bodies respond to a fall in arterialp# .

A:-Only i, ii and iv

B:-Only i and iv

C:-Only ii and iv

D:-All the above i, ii, iii and iv
Correct Answer:- Option-B

Question65:-True statement about airway resistance is/are ?

i. Major site of resistance to airflow is medium sized bronchi.

ii. Tone of bronchial smooth muscles which is an important determinant of caliber of
airways is under autonomic control.

iii. The relationship between lung volume and airway resistance is linear.

iv. Density and viscosity of gas that is breathed affects the pressure drop along the
airway.

A:-Only ii and iii
B:-Only ii and iv
C:-Only i, ii and iii
D:-Only i, ii and iv
Correct Answer:- Option-D
Question66:-All are true regarding regulation of gastric secretion Except
A:-Histamine is the strongest agonist of #+ secretion
B:-Parietal cells express CCK1 (cholecystokinin type 1) receptor for gastrin

C:-When pH of gastric lumen reaches below 3, somatostatin is released from
endocrine cells in antral mucosa

D:-Acetyl choline binds to ४३ receptors and open ca?+channels in apical plasma
membrane

Correct Answer:- Option-B