Q: Which equation best represents the pathway of a two-neuron chain in the autonomic nervous system?

$$\text{Preganglionic neuron} \rightarrow \text{Postganglionic neuron} \rightarrow \text{Effector organ}$$

Question 1

Which of the following best describes the difference between the somatic and autonomic nervous systems?

Accepted Answer

The somatic nervous system controls voluntary movements of skeletal muscles, while the autonomic nervous system regulates involuntary functions of smooth muscle, cardiac muscle, and glands.

Question 2

A patient experiences increased heart rate, dilated pupils, and decreased digestive activity after a stressful event. Which division of the autonomic nervous system is primarily responsible for these effects?

Accepted Answer

Sympathetic division

Question 3

Which neurotransmitter is released by preganglionic neurons in both the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

Acetylcholine

Question 4

Where are the preganglionic neurons of the sympathetic division of the autonomic nervous system located?

Accepted Answer

Thoracolumbar region of the spinal cord (T1–L2)

Question 5

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

Accepted Answer

It acts as a postganglionic neuron and releases norepinephrine and epinephrine into the bloodstream.

Question 6

Which of the following is a function of the enteric nervous system?

Accepted Answer

Coordinating digestive tract motility and secretion independently of the central nervous system

Question 7

Which neurotransmitter is primarily released by postganglionic neurons of the sympathetic division?

Accepted Answer

Norepinephrine

Question 8

A patient is given a drug that blocks acetylcholine receptors on target organs. Which division of the autonomic nervous system would be most affected?

Accepted Answer

Parasympathetic division

Question 9

Which of the following best describes dual innervation?

Accepted Answer

A single organ receives input from both the sympathetic and parasympathetic divisions, allowing for precise regulation.

Question 10

Which of the following is an example of a visceral reflex?

Accepted Answer

Constriction of the pupils in response to bright light

Question 11

Which of the following best describes the location of ganglionic neurons in the sympathetic division?

Accepted Answer

In the sympathetic chain ganglia, collateral ganglia, and adrenal medulla

Question 12

Which effect is most likely to occur during parasympathetic stimulation?

Accepted Answer

Increased digestive activity

Question 13

Which equation best represents the pathway of a two-neuron chain in the autonomic nervous system?

Accepted Answer

$$	ext{Preganglionic neuron} ightarrow 	ext{Postganglionic neuron} ightarrow 	ext{Effector organ}$$

Question 14

Which of the following is true regarding the neurotransmitters released by postganglionic neurons in the parasympathetic division?

Accepted Answer

They release acetylcholine onto target organs.

Question 15

A patient with a spinal cord injury at the level of T1–L2 is most likely to experience disruption in which division of the autonomic nervous system?

Accepted Answer

Sympathetic division

Question 16

Which of the following best describes the target organs of the parasympathetic division?

Accepted Answer

Smooth muscle, cardiac muscle, and glands

Question 17

Which scenario best illustrates the concept of dual innervation?

Accepted Answer

The heart receives both sympathetic and parasympathetic input, allowing for increased or decreased heart rate depending on the body's needs.

Question 18

Which of the following is a major role of the sympathetic division?

Accepted Answer

Stimulating fight-or-flight responses such as increased heart rate and energy mobilization

Question 19

Which of the following best describes the location of preganglionic neurons in the parasympathetic division?

Accepted Answer

Cranial nerves III, VII, IX, X and sacral region S2–S4

Question 20

A patient is exposed to a toxin that inhibits norepinephrine release from postganglionic neurons. Which physiological effect would most likely be observed?

Accepted Answer

Decreased heart rate and increased digestive activity

Autonomic Nervous System: Structure, Function, and Comparison

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