Q: Which equation correctly represents the effect of sympathetic tone on blood vessel diameter and blood pressure?

$$\text{Blood Pressure} \propto \frac{1}{\text{Vessel Diameter}}$$

Question 1

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

Accepted Answer

It innervates smooth muscles, cardiac muscle, and glands to maintain optimal support for body activities.

Question 2

During vigorous exercise, which physiological changes are primarily mediated by the sympathetic division of the ANS?

Accepted Answer

Shunting blood to skeletal muscles and heart, dilation of bronchioles, and release of glucose from the liver.

Question 3

Which neurotransmitter is released by all preganglionic neurons in both the sympathetic and parasympathetic divisions of the ANS?

Accepted Answer

Acetylcholine (ACh)

Question 4

A patient with damage to the neural crest during development would most likely have impairments in which ANS structures?

Accepted Answer

Postganglionic neurons, adrenal medulla, and all ganglia

Question 5

Which of the following best explains the difference in fiber length between the sympathetic and parasympathetic divisions?

Accepted Answer

Sympathetic division has short preganglionic and long postganglionic fibers, while parasympathetic division has long preganglionic and short postganglionic fibers.

Question 6

Which equation correctly represents the effect of sympathetic tone on blood vessel diameter and blood pressure?

Accepted Answer

$$	ext{Blood Pressure} \propto \frac{1}{	ext{Vessel Diameter}}$$

Question 7

A patient presents with orthostatic hypotension and dry eyes. Which age-related change in the ANS is most likely responsible?

Accepted Answer

Decline in ANS efficiency due to structural changes at preganglionic axon terminals

Question 8

Which of the following is TRUE regarding the location of autonomic ganglia in the parasympathetic division?

Accepted Answer

They are located in or near the walls of the visceral effector organ.

Question 9

Which pathway is responsible for sympathetic innervation of the abdominal organs?

Accepted Answer

Preganglionic fibers pass through the trunk ganglion and synapse in collateral ganglia such as the celiac and mesenteric ganglia.

Question 10

Which of the following best describes the effect of acetylcholine binding to muscarinic receptors in cardiac muscle?

Accepted Answer

It slows heart rate.

Question 11

A patient with Raynaud's disease experiences painful, exaggerated vasoconstriction in the fingers and toes. Which division of the ANS is primarily responsible for this response?

Accepted Answer

Sympathetic division

Question 12

Which cranial nerve accounts for approximately 90% of all preganglionic parasympathetic fibers in the body and serves thoracic and abdominal viscera?

Accepted Answer

Vagus nerve (X)

Question 13

Which of the following is a unique role of the sympathetic division of the ANS?

Accepted Answer

Activation of sweat glands and release of renin from kidneys

Question 14

Which type of receptor is found on all postganglionic neurons and always produces a stimulatory effect when bound by acetylcholine?

Accepted Answer

Nicotinic receptor

Question 15

Which of the following best describes the concept of dual innervation in the ANS?

Accepted Answer

All visceral organs are served by both sympathetic and parasympathetic divisions, which usually have opposite effects.

Question 16

Which of the following equations best represents the relationship between metabolic rate and sympathetic activity?

Accepted Answer

$$	ext{Metabolic Rate} \propto 	ext{Sympathetic Activity}$$

Question 17

Which of the following is a correct statement about the efferent pathways in the ANS compared to the somatic nervous system?

Accepted Answer

The ANS uses a two-neuron chain consisting of a lightly myelinated preganglionic neuron and a nonmyelinated postganglionic neuron.

Question 18

Which of the following best explains why the effects of the sympathetic division are longer-lasting and more diffuse than those of the parasympathetic division?

Accepted Answer

Norepinephrine is inactivated more slowly than acetylcholine, and adrenal medulla hormones prolong the effect.

Question 19

A patient with autonomic neuropathy due to diabetes mellitus may present with which of the following symptoms?

Accepted Answer

Sexual dysfunction, dizziness after standing, urinary incontinence, and impaired sweating

Autonomic Nervous System: Structure, Function, and Divisions

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