Q: Which equation best represents the pathway of a visceral reflex arc?

$$\text{Receptor} \rightarrow \text{Afferent neuron} \rightarrow \text{Integrating center} \rightarrow \text{Efferent neuron} \rightarrow \text{Effector}$$

Q: Which of the following is a correct sequence for the somatic motor pathway?

$$\text{CNS} \rightarrow \text{Single myelinated neuron} \rightarrow \text{Skeletal muscle}$$

Question 1

Which of the following best describes the primary function of the autonomic nervous system (ANS)?

Accepted Answer

It manages unconscious processes responsible for homeostasis.

Question 2

A patient presents with a rapid heart rate and dilated pupils after a car accident. Which division of the ANS is most likely responsible for these symptoms?

Accepted Answer

Sympathetic division

Question 3

Which of the following is TRUE regarding the efferent pathway of the autonomic motor division?

Accepted Answer

It consists of two neurons: a preganglionic and a postganglionic neuron.

Question 4

Which neurotransmitter is released by most sympathetic postganglionic fibers?

Accepted Answer

Norepinephrine

Question 5

In the visceral reflex arc, which component is responsible for detecting changes such as stretch or tissue damage?

Accepted Answer

Receptor

Question 6

Which of the following statements about autonomic tone is correct?

Accepted Answer

Parasympathetic tone maintains smooth muscle tone in the intestines.

Question 7

Which structure is NOT innervated by both sympathetic and parasympathetic divisions (i.e., does NOT receive dual innervation)?

Accepted Answer

Sweat glands

Question 8

A drug that blocks muscarinic acetylcholine receptors would primarily affect which division of the ANS?

Accepted Answer

Parasympathetic division

Question 9

Which of the following best explains why the sympathetic division can produce widespread effects throughout the body?

Accepted Answer

Neuronal divergence allows one preganglionic neuron to synapse with many postganglionic neurons.

Question 10

Which equation best represents the pathway of a visceral reflex arc?

Accepted Answer

$$	ext{Receptor} ightarrow 	ext{Afferent neuron} ightarrow 	ext{Integrating center} ightarrow 	ext{Efferent neuron} ightarrow 	ext{Effector}$$

Question 11

Which of the following is a cooperative effect of dual innervation?

Accepted Answer

Both divisions act on different cells to produce a unified increase in salivary secretion.

Question 12

Which anatomical feature distinguishes the sympathetic division from the parasympathetic division?

Accepted Answer

Sympathetic ganglia are located near the spinal cord; parasympathetic ganglia are near or within target organs.

Question 13

Which of the following is TRUE about the enteric nervous system?

Accepted Answer

It innervates smooth muscle and glands of the gastrointestinal tract.

Question 14

A patient with damage to the lateral horns of the spinal cord at T1-L2 would most likely experience deficits in which division of the ANS?

Accepted Answer

Sympathetic division

Question 15

Which of the following best describes the difference in neuronal divergence between the sympathetic and parasympathetic divisions?

Accepted Answer

Sympathetic division has greater neuronal divergence, allowing one preganglionic neuron to affect many postganglionic neurons.

Question 16

Which of the following is a correct sequence for the somatic motor pathway?

Accepted Answer

$$	ext{CNS} ightarrow 	ext{Single myelinated neuron} ightarrow 	ext{Skeletal muscle}$$

Question 17

Which of the following would most likely occur during increased parasympathetic activity?

Accepted Answer

Conservation of energy and promotion of sedentary activities

Question 18

Which equation best represents the neurotransmitter release in the sympathetic division?

Accepted Answer

$$	ext{Preganglionic neuron} \xrightarrow{ACh} 	ext{Postganglionic neuron} \xrightarrow{NE} 	ext{Effector}$$

Question 19

Which central nervous system structure is the major visceral motor control center for the ANS?

Accepted Answer

Hypothalamus

Autonomic Nervous System and Visceral Reflexes: Structure, Function, and Divisions

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