Question 1

Which of the following best describes the concept of homeostasis as defined by Walter Cannon?

Accepted Answer

The body's ability to maintain relatively stable internal conditions despite continuous changes in the external environment.

Question 2

Which of the following is NOT an example of a physiological process regulated by homeostasis?

Accepted Answer

Voluntary movement of skeletal muscles during exercise.

Question 3

A patient is experiencing a rapid drop in blood pressure. Which component of the homeostatic control mechanism first detects this change?

Accepted Answer

Receptor

Question 4

Which of the following best illustrates a negative feedback mechanism?

Accepted Answer

Shivering to increase body temperature when cold.

Question 5

In a homeostatic control system, what is the primary function of the control center?

Accepted Answer

To determine the set point and initiate the appropriate response.

Question 6

Which of the following scenarios represents positive feedback?

Accepted Answer

Amplification of platelet aggregation during blood clot formation.

Question 7

A patient has suffered a spinal cord injury that impairs the autonomic nervous system's ability to regulate heart rate. Which division of the nervous system is primarily affected?

Accepted Answer

Autonomic nervous system

Question 8

Which of the following is a key difference between the autonomic nervous system (ANS) and the somatic nervous system (SNS)?

Accepted Answer

The ANS uses a two-neuron chain with ganglia, while the SNS uses a single, thick, myelinated axon.

Question 9

During a stressful situation, which of the following physiological changes is most likely to occur due to sympathetic nervous system activation?

Accepted Answer

Dilation of pupils and increased blood glucose levels

Question 10

Which of the following best describes the role of the parasympathetic nervous system after a meal?

Accepted Answer

It stimulates digestion, defecation, and diuresis.

Question 11

Which of the following organs receives only sympathetic innervation?

Accepted Answer

Sweat glands

Question 12

A patient is prescribed an alpha-blocking drug to treat hypertension. What is the physiological basis for this treatment?

Accepted Answer

Alpha-blockers inhibit vasoconstriction, leading to decreased vascular resistance and lower blood pressure.

Question 13

Which of the following is a unique regulatory role of the sympathetic nervous system?

Accepted Answer

Control of sweat gland activity

Question 14

Which of the following best describes the mechanism of action for protein/peptide hormones?

Accepted Answer

They bind to cell surface receptors, activating a G protein and generating a second messenger such as cAMP.

Question 15

Which of the following equations correctly represents the relationship between hormone concentration, receptor concentration, and affinity in determining target cell activation?

Accepted Answer

$$ Target\ Cell\ Activation \propto [Hormone] 	imes [Receptors] 	imes Affinity $$

Question 16

Which of the following is an example of humoral stimulus for hormone release?

Accepted Answer

Release of parathyroid hormone (PTH) in response to low blood calcium levels.

Question 17

A patient has abnormally high levels of a hormone due to a tumor in the anterior pituitary. Which type of stimulus is most likely responsible for the continued hormone release?

Accepted Answer

Hormonal stimulus

Question 18

Which of the following best explains why the effects of the endocrine system are generally slower but longer-lasting than those of the nervous system?

Accepted Answer

Hormones travel through the bloodstream and often act on distant target organs.

Question 19

Which of the following best describes the three-tiered hormonal stimulus system involving the hypothalamus, pituitary, and target endocrine gland?

Accepted Answer

The hypothalamus releases a releasing hormone, which stimulates the anterior pituitary to release a tropic hormone, which then stimulates the target endocrine gland.

Question 20

A patient is unable to urinate and has absent bowel sounds after surgery. Which division of the autonomic nervous system is most likely suppressed by the anesthetic?

Accepted Answer

Parasympathetic nervous system

Homeostasis, Autonomic Nervous System, and Endocrine System: Control Mechanisms in Anatomy & Physiology

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