Question

Question 42 1 pts Which of the following may increase cardiac output? A drop in arteriolar resistance O A drop in end-diastolic volume O A drop in conduction velocity in the heart A drop in sympathetic activity to ventricular muscle A drop in parasympathetic activity to the pacemaker cells

Answer 1

ANSWERS

42- Option E is correct

• A Drop in parasympathetic activity to the pacemaker cells increase cardiac output.
• parasympathetic nervous system releases the hormone acetylcholine to slow the heart rate thereby reduce cardiac output.
• so if there is a dicrease in parasympathetic activity on SA Node (pacemaker cell) there will be a rise in heart rate and cardiac output.

43- option D is correct

• When detected by peripheral chemoreceptors, increased [H+] Inhibit respiration.
• increased proton level alter the process of electron transport chain thereby inhibit production of ATP which leads to inhibition of respiration mechanism