Question

The motor part of the ANS consists of two branches which usually have opposing actions. Which of these can increase heart rate?
a. the sympathetic division
b. the parasympathetic division

Answer 1

Answer:

B. The sympathetic division.

Explanation:

The sympathetic system uses noradrenaline as their NT, though alpha and beta adrenergic receptors. B1 adrenergic receptors are cardioselective receptors that when estimulated increases the activity of the heart. When the sinoatrial node is estimulated by the sympathetic system, the heart rate increases.