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

$$\text{Receptor} \rightarrow \text{Sensory Neuron} \rightarrow \text{Integration Center} \rightarrow \text{Motor Neuron(s)} \rightarrow \text{Effector}$$

Question 1

Which of the following best describes the structural organization of the Autonomic Nervous System (ANS) within the Peripheral Nervous System (PNS)?

Accepted Answer

The ANS is a motor division of the PNS that uses a two-neuron relay to innervate cardiac muscle, smooth muscle, and glands.

Question 2

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

Accepted Answer

Acetylcholine (Ach)

Question 3

A patient presents with increased heart rate, dilated pupils, and decreased digestive activity. Which division of the ANS is most active?

Accepted Answer

Sympathetic division

Question 4

Which of the following statements about the somatic nervous system is correct?

Accepted Answer

It releases acetylcholine (Ach) at the neuromuscular junction, always producing an excitatory effect.

Question 5

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

Accepted Answer

Sympathetic division has short preganglionic fibers and long postganglionic fibers.

Question 6

Which receptor type is always excitatory and is found on all postganglionic neurons in the ANS?

Accepted Answer

Nicotinic receptor

Question 7

A drug that blocks muscarinic receptors would most likely affect which of the following?

Accepted Answer

Inhibitory and excitatory responses in parasympathetic target tissues

Question 8

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

Accepted Answer

Both divisions innervate the same tissue, producing opposite effects depending on which division is active.

Question 9

Which pathway is unique to the sympathetic division and results in the release of epinephrine and norepinephrine directly into the bloodstream?

Accepted Answer

Adrenal medullae pathway

Question 10

Which cranial nerve supplies approximately 75% of all parasympathetic output?

Accepted Answer

CN X (Vagus)

Question 11

Which adrenergic receptor is primarily responsible for increased heart rate and force of contraction?

Accepted Answer

Beta-1 receptor

Question 12

If blood pressure drops, which of the following describes the response of the sympathetic nervous system?

Accepted Answer

Sympathetic fibers increase activity, causing blood vessels to constrict and BP to increase.

Question 13

Which of the following is a correct description of the neurotransmitter and receptor interaction in the sympathetic division's postganglionic fibers?

Accepted Answer

Postganglionic fibers release NE, which binds to adrenergic receptors.

Question 14

Which of the following is true regarding visceral reflexes?

Accepted Answer

Short reflexes bypass the CNS and are primarily found in the enteric nervous system.

Question 15

Which equation best represents the pathway of a visceral reflex?

Accepted Answer

$$	ext{Receptor} ightarrow 	ext{Sensory Neuron} ightarrow 	ext{Integration Center} ightarrow 	ext{Motor Neuron(s)} ightarrow 	ext{Effector}$$

Question 16

Which of the following best describes the effect of beta-2 adrenergic receptors?

Accepted Answer

Inhibitory effect on bronchioles, causing dilation

Question 17

Which of the following is a real-world example of dual innervation?

Accepted Answer

Sympathetic innervation increases heart rate, while parasympathetic innervation decreases heart rate.

Question 18

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

Accepted Answer

Ganglia are located close to or within the effectors.

Question 19

Which higher brain structure is considered the major integration center for the ANS, communicating with the limbic system and cerebral cortex?

Accepted Answer

Hypothalamus

Chapter 14: The Autonomic Nervous System – Structure and Function

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