Q: Which equation correctly represents the negative feedback loop regulating cortisol secretion?

$\text{Increased CRH} \rightarrow \text{Increased ACTH} \rightarrow \text{Increased cortisol} \rightarrow \text{Decreased CRH and ACTH}$

Q: Which of the following equations best represents the antagonistic regulation of blood glucose by insulin and glucagon?

$\text{Insulin} \rightarrow \text{Decrease blood glucose} \, ; \, \text{Glucagon} \rightarrow \text{Increase blood glucose}$

Question 1

Which of the following best describes the process of sensory transduction at a mechanoreceptor in the skin?

Accepted Answer

Mechanical stimulus opens sodium ion channels, causing an influx of Na$^+$, which generates a receptor potential. If threshold is reached, voltage-gated sodium channels open, triggering an action potential.

Question 2

A patient presents with loss of fine touch discrimination in the fingertips. Which mechanoreceptor is most likely affected?

Accepted Answer

Meissner (tactile) corpuscles

Question 3

Which equation correctly represents the negative feedback loop regulating cortisol secretion?

Accepted Answer

$	ext{Increased CRH} ightarrow 	ext{Increased ACTH} ightarrow 	ext{Increased cortisol} ightarrow 	ext{Decreased CRH and ACTH}$

Question 4

Which of the following best explains why the effects of hormones are generally slower but longer-lasting than those of neurotransmitters?

Accepted Answer

Hormones circulate in the blood and act on distant target cells, often altering gene expression and protein synthesis.

Question 5

A person with damage to the hypothalamus may have difficulty regulating which of the following homeostatic functions?

Accepted Answer

Thermoregulation, water balance, and hunger

Question 6

Which of the following statements about the pathway of olfactory sensation is correct?

Accepted Answer

Odorant molecules bind to receptors in the olfactory epithelium, triggering a G-protein cascade that produces cAMP, which opens ion channels and generates an action potential sent to the olfactory bulb.

Question 7

Which of the following best describes the difference between general and special senses?

Accepted Answer

General senses use receptive endings of sensory neurons throughout the body, while special senses use specialized receptor cells located in the head.

Question 8

Which hormone is released in response to increased blood solute concentration and acts to conserve water by decreasing urine volume?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

A patient with hyperthyroidism is likely to have which of the following symptoms?

Accepted Answer

Increased basal metabolic rate (BMR), weight loss, and heat intolerance

Question 10

Which of the following correctly describes the action of water-soluble hormones?

Accepted Answer

They bind to cell membrane receptors, activate a second messenger (such as cAMP), and phosphorylate enzymes to catalyze cellular responses.

Question 11

Which of the following equations best represents the antagonistic regulation of blood glucose by insulin and glucagon?

Accepted Answer

$	ext{Insulin} ightarrow 	ext{Decrease blood glucose} \, ; \, 	ext{Glucagon} ightarrow 	ext{Increase blood glucose}$

Question 12

Which structure in the ear is primarily responsible for detecting dynamic equilibrium?

Accepted Answer

Ampulla of the semicircular canals

Question 13

A patient with damage to the anterior pituitary would most likely experience which of the following?

Accepted Answer

Decreased secretion of hormones such as hGH, TSH, and ACTH

Question 14

Which of the following best describes the function of the pineal gland?

Accepted Answer

Secretes melatonin to regulate diurnal rhythms

Question 15

Which of the following is a correct pathway for visual information from the retina to the brain?

Accepted Answer

Photoreceptors generate receptor potentials, bipolar cells produce graded potentials, ganglion cells generate action potentials transmitted through the optic nerve to the thalamus and then to the primary visual cortex.

Question 16

Which of the following best explains the rapid adaptation of Meissner (tactile) corpuscles?

Accepted Answer

They quickly stop generating action potentials when a stimulus persists, allowing the body to ignore constant touch.

Question 17

Which of the following best describes the effect of calcitonin released from the thyroid gland?

Accepted Answer

Decreases blood calcium levels by inhibiting osteoclast activity

Question 18

Which of the following is a real-life example of referred pain?

Accepted Answer

A person experiencing left arm pain during a heart attack due to visceral sensory information being interpreted as somatic pain.

Question 19

Which of the following best describes the function of osmoreceptors in the hypothalamus?

Accepted Answer

Monitor solute concentration in blood and stimulate ADH release when solute levels are high

Special Senses and Endocrine System: ANP Study Guide

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