Which of the following is/are characteristic of the parasympathetic nervous syst

Question

Which of the following is/are characteristic of the parasympathetic nervous system? Fill blank with a YES response for each of the following that is/are characteristic of the parasympathetic nervous system but not of the sympathetic nervous system? Otherwise, put a NO in the blank. Ganglia in or near target tissues _____ nicotinic receptors on postganglionic neurons _____ muscarinic receptors on some target tissues _____ Beta-1 receptors on some target tissues _____ Cholinergic preganglionic neurons _____ Propranolol causes a decrease in heart rate because it _____ (stimulates/deactives) the _____ receptors in the sinoatrial node of the heart.

Explanation / Answer

a) Ganglia in or near target tissue is No

b) nicotinic receptors on postganglionic neurons is Yes

c)muscarinic receptors on some target tissue is No

d) Beta-1 receptors on some target tissue is No

e)Cholinergic pregangionic neurons is yes

Propranolol causes a decrease in heart rate becasue it deactivates the beta receptors inthe sinoatrial node of the heart

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