Physiology

Question 1

Phase of the cardiac cycle most affected by increase in heart rate

Answer 1

Reduced ventricular filling

Question 2

Increased urinary excretion of ammonia in diabetic ketoacidosis

Answer 2

Adaptive increase in ammonia synthesis with chronic acidosis

Question 3

Give 2 conditions that will decrease ADH effect in the collecting tubule via inhibition of G protein

Answer 3

Lithium intake and hypercalcemia

Question 4

What are the effects of somatostatin in the brain, GIT, and pancreas

Answer 4

Brain - act on hypothalamus to inhibit GH
GIT - act on stomach to inhibit gastrin etc. Main inhibitor
Pancreas - secreted by delta cell, inhibits insulin and glucagon

Question 5

When is aortic pressure lowest?

Answer 5

Just before the ventricles contract