Question 1

Which of the following best describes 'dual innervation' in the autonomic nervous system (ANS)?

Accepted Answer

Most organs receive input from both the sympathetic and parasympathetic divisions, often with opposing effects.

Question 2

A patient is experiencing increased heart rate and force of contraction during a stressful event. Which division of the ANS is primarily responsible, and what neurotransmitter is most likely involved?

Accepted Answer

Sympathetic division; norepinephrine

Question 3

Which of the following is an example of an organ that is innervated by only one division of the ANS?

Accepted Answer

Blood vessels, which are primarily controlled by the sympathetic division

Question 4

What is the functional significance of autonomic tone in the regulation of blood vessel diameter?

Accepted Answer

It allows for a greater range of control by maintaining a baseline level of contraction that can be increased or decreased.

Question 5

During exercise, blood flow to skeletal muscles increases. Which mechanism best explains this change?

Accepted Answer

A decrease in sympathetic tone leads to smooth muscle relaxation and vasodilation.

Question 6

Which structure is considered the highest-level control center for the autonomic nervous system, integrating visceral, emotional, and behavioral responses?

Accepted Answer

Hypothalamus

Question 7

A patient with damage to the medulla oblongata would most likely have difficulty regulating which of the following?

Accepted Answer

Heart rate and respiration

Question 8

Which of the following best describes a visceral reflex arc?

Accepted Answer

It consists of a receptor, sensory neuron, processing center, two visceral motor neurons, and an effector.

Question 9

Which of the following statements about short visceral reflexes is correct?

Accepted Answer

They bypass the central nervous system and have a faster response time.

Question 10

A person sees and smells food, which triggers salivation before eating. Which type of visceral reflex is primarily responsible for this response?

Accepted Answer

Long reflex involving the central nervous system

Question 11

Which of the following best explains why the parasympathetic division is often called the 'rest-and-digest' system?

Accepted Answer

It promotes activities that conserve energy and increase digestive processes.

Question 12

Which of the following equations best represents the relationship between sympathetic tone and blood vessel diameter?

Accepted Answer

$$D = D_0$ - kS$$

Question 13

Which of the following is a correct sequence for the components of a visceral reflex arc?

Accepted Answer

Receptor → Sensory neuron → Processing center → Preganglionic neuron → Postganglionic neuron → Effector

Question 14

Which of the following best describes the role of the hypothalamus in autonomic regulation?

Accepted Answer

It integrates visceral, emotional, and behavioral responses and signals the pituitary gland to release hormones.

Question 15

A patient is able to consciously slow their heart rate using biofeedback therapy. Which brain region is most likely involved in this voluntary control over an autonomic function?

Accepted Answer

Cerebral cortex

Question 16

Which of the following is true regarding the difference between long and short visceral reflexes?

Accepted Answer

Long reflexes involve the CNS and are slower, while short reflexes bypass the CNS and are faster.

Question 17

Which of the following best explains why the sympathetic division is called the 'fight-or-flight' system?

Accepted Answer

It prepares the body for emergencies by increasing heart rate, blood pressure, and energy availability.

Question 18

Which of the following is a real-life example of a short visceral reflex?

Accepted Answer

The stomach contracting in response to being stretched by food.

Question 19

Which of the following best describes the role of autonomic plexuses in the thoracic and abdominopelvic cavities?

Accepted Answer

They are networks formed by mingled sympathetic postganglionic and parasympathetic preganglionic fibers.

Question 20

Which of the following best explains why short visceral reflexes are capable of controlling digestive functions independently of the CNS?

Accepted Answer

Sensory neurons directly stimulate postganglionic neurons within local nerve plexuses.

The Autonomic Nervous System: Dual Innervation, Tone, and Visceral Reflexes

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