Q: Which equation best represents the synthesis of acetylcholine in cholinergic neurons?

$$\text{Acetyl CoA} + \text{Choline} \rightarrow \text{Acetylcholine}$$

Q: Which equation describes the inactivation of norepinephrine at the synapse?

$$\text{Norepinephrine} \xrightarrow{\text{MAO}} \text{Inactive metabolites}$$

Q: Which equation best represents the effect of beta-adrenergic receptor activation on second messengers?

$$\text{Beta receptor activation} \rightarrow \uparrow \text{cAMP}$$

Question 1

Which of the following best describes the primary function of the autonomic division of the efferent nervous system?

Accepted Answer

Maintaining homeostasis by regulating involuntary functions such as heart rate, digestion, and respiratory rate.

Question 2

A patient is experiencing increased heart rate and dilated pupils after a stressful event. Which branch of the autonomic nervous system is most active, and which neurotransmitter is primarily responsible?

Accepted Answer

Sympathetic branch; norepinephrine

Question 3

Which equation best represents the synthesis of acetylcholine in cholinergic neurons?

Accepted Answer

$$	ext{Acetyl CoA} + 	ext{Choline} ightarrow 	ext{Acetylcholine}$$

Question 4

Which of the following is a hallmark of antagonistic control in the autonomic division?

Accepted Answer

Most internal organs receive both sympathetic and parasympathetic innervation, with one branch being excitatory and the other inhibitory.

Question 5

Which neurotransmitter is released by postganglionic sympathetic neurons at most target tissues?

Accepted Answer

Norepinephrine

Question 6

A drug that blocks muscarinic receptors would most likely affect which branch of the autonomic nervous system and what type of response?

Accepted Answer

Parasympathetic branch; decreased 'rest-and-digest' responses

Question 7

Which equation describes the inactivation of norepinephrine at the synapse?

Accepted Answer

$$	ext{Norepinephrine} \xrightarrow{	ext{MAO}} 	ext{Inactive metabolites}$$

Question 8

Which of the following best explains why excessive nicotine exposure can cause respiratory paralysis?

Accepted Answer

Nicotine overstimulates nicotinic acetylcholine receptors at the neuromuscular junction, causing persistent depolarization and preventing muscle contraction.

Question 9

Which of the following is true regarding the structure of autonomic pathways?

Accepted Answer

They consist of two efferent neurons in series: a preganglionic neuron and a postganglionic neuron.

Question 10

Which equation best represents the effect of beta-adrenergic receptor activation on second messengers?

Accepted Answer

$$	ext{Beta receptor activation} ightarrow \uparrow 	ext{cAMP}$$

Question 11

Which organ receives only sympathetic innervation and is under tonic control?

Accepted Answer

Sweat glands

Question 12

Which neurotransmitter and receptor are involved at the neuromuscular junction in the somatic motor division?

Accepted Answer

Acetylcholine and nicotinic receptor

Question 13

A patient is given a beta-blocker. Which physiological effect would you expect?

Accepted Answer

Decreased heart rate and contractility

Question 14

Which equation best represents the effect of alpha-2 adrenergic receptor activation?

Accepted Answer

$$	ext{Alpha-2 receptor activation} ightarrow \downarrow 	ext{cAMP}$$

Question 15

Which of the following best describes the effect of chronic exposure to an agonist like nicotine on nicotinic acetylcholine receptors?

Accepted Answer

Initially activates the receptor, but prolonged exposure leads to desensitization and up-regulation of receptor numbers.

Question 16

Which of the following is a real-world example of cooperative control in the autonomic nervous system?

Accepted Answer

The male reproductive system, where both sympathetic and parasympathetic branches contribute to sexual function.

Question 17

Which equation best represents the effect of muscarinic receptor activation on second messengers in parasympathetic target tissues?

Accepted Answer

$$	ext{Muscarinic receptor activation} ightarrow \uparrow 	ext{IP}_3 	ext{ and } \uparrow 	ext{Ca}^{2+}$$

Question 18

Which of the following best describes the role of the adrenal medulla in the sympathetic nervous system?

Accepted Answer

It acts as a modified sympathetic ganglion, releasing epinephrine into the bloodstream as a neurohormone.

Question 19

Which equation best represents the effect of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

$$	ext{Acetylcholine} \xrightarrow{	ext{AChE}} 	ext{Acetate} + 	ext{Choline}$$

Efferent Division: Autonomic and Somatic Motor Control – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards