Question 1

Which of the following best describes the general role of the autonomic nervous system (ANS)?

Accepted Answer

Control of involuntary functions such as heart rate, digestion, and glandular secretion

Question 2

A patient is experiencing increased heart rate, dilated pupils, and decreased digestive activity after a car accident. Which division of the ANS is primarily responsible for these effects?

Accepted Answer

Sympathetic division

Question 3

Which neurotransmitter is released by parasympathetic preganglionic neurons, and what type of receptor does it bind to on the postganglionic neuron?

Accepted Answer

Acetylcholine; nicotinic receptor

Question 4

Which anatomical feature distinguishes the parasympathetic division from the sympathetic division in terms of preganglionic fiber length?

Accepted Answer

Parasympathetic preganglionic fibers are long; sympathetic preganglionic fibers are short

Question 5

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

Accepted Answer

Ganglia are located within or near the effector organ wall

Question 6

A researcher applies a muscarinic antagonist to a gland innervated by the parasympathetic nervous system. What is the expected effect?

Accepted Answer

Decreased glandular secretion due to blocked muscarinic receptor activation

Question 7

Which equation correctly represents the conduction velocity ($$v) of a $$myelinated axon as a function of axon diameter ($$d$$), given that $$v \propto \sqrt{d}$$?

Accepted Answer

$$v = k \cdot \sqrt{d}$$

Question 8

Which of the following best explains 'dual innervation' in the context of the ANS?

Accepted Answer

Both divisions innervate the same effector, often producing opposing effects

Question 9

Which pathway correctly describes the neurotransmitter and receptor sequence from a parasympathetic preganglionic neuron to its effector?

Accepted Answer

ACh → nicotinic receptor → ACh → muscarinic receptor

Question 10

Which of the following is a real-life example of a visceral reflex mediated by the ANS?

Accepted Answer

Regulation of heart rate in response to blood pressure changes (baroreceptor reflex)

Question 11

A patient with damage to the vagus nerve would most likely experience which of the following symptoms?

Accepted Answer

Increased heart rate and decreased digestive activity

Question 12

Which of the following statements about the sympathetic division is correct?

Accepted Answer

Its preganglionic neurons originate in the thoracolumbar region of the spinal cord

Question 13

Which of the following mechanisms is used to terminate neurotransmitter effects in autonomic pathways?

Accepted Answer

Enzymatic breakdown of neurotransmitter in the synaptic cleft

Question 14

Which of the following best describes the effect of tonic control by the sympathetic division on blood vessels?

Accepted Answer

Blood vessel diameter is regulated solely by varying levels of sympathetic stimulation

Question 15

Which of the following is TRUE regarding the divergence of preganglionic fibers in the parasympathetic division?

Accepted Answer

One preganglionic fiber synapses with several (4-5) postganglionic neurons, resulting in minimal divergence

Question 16

Which of the following correctly matches the neurotransmitter and receptor type found at the effector in the parasympathetic pathway?

Accepted Answer

Acetylcholine; muscarinic receptor

Question 17

Which brain region is considered the 'boss' of overall integration of the ANS?

Accepted Answer

Hypothalamus

Question 18

A drug that blocks nicotinic receptors would most directly affect which part of the parasympathetic pathway?

Accepted Answer

Transmission from preganglionic neuron to postganglionic neuron

Question 19

Which of the following equations best represents the relationship between the number of postganglionic neurons ($$N_{post}) $$and preganglionic neurons ($$N_{pre}) in $$the parasympathetic division, given minimal divergence?

Accepted Answer

$$N_{post} \approx N_{pre} 	imes 4$$

Autonomic Nervous System: Parasympathetic and Sympathetic Divisions

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