Q: Which equation correctly represents the conversion of ATP to cyclic AMP during nonsteroid hormone action?

$\mathrm{ATP} \xrightarrow{\text{adenylate cyclase}} \mathrm{cAMP} + \mathrm{PP_i}$

Question 1

Which of the following best describes the primary difference between the endocrine and nervous systems in terms of their signaling mechanisms?

Accepted Answer

The endocrine system releases hormones into body fluids for slower, but longer-lasting effects.

Question 2

A farmer notices his turkeys have unusually large legs, as depicted in the cartoon. Which hormone is most likely responsible for this abnormal growth?

Accepted Answer

Growth Hormone (GH)

Question 3

Steroid hormones exert their effects by which of the following mechanisms?

Accepted Answer

Diffusing through the cell membrane, binding to intracellular receptors, and activating gene transcription.

Question 4

Which equation correctly represents the conversion of ATP to cyclic AMP during nonsteroid hormone action?

Accepted Answer

$\mathrm{ATP} \xrightarrow{	ext{adenylate cyclase}} \mathrm{cAMP} + \mathrm{PP_i}$

Question 5

A patient presents with symptoms of myxedema, including low metabolic rate and mental dullness. Which hormone is most likely deficient?

Accepted Answer

Thyroxine ($T_4$)

Question 6

Which of the following is a correct sequence of events for steroid hormone action?

Accepted Answer

Steroid hormone diffuses into cell, binds to receptor, hormone-receptor complex activates DNA, mRNA is produced.

Question 7

Which hormone is secreted in response to elevated blood calcium levels and acts to lower calcium concentration?

Accepted Answer

Calcitonin

Question 8

A patient with Addison disease is likely to exhibit which of the following laboratory findings?

Accepted Answer

Decreased sodium, glucose, and blood pressure; increased potassium

Question 9

Which hormone is released from the posterior pituitary and is inhibited by alcohol consumption, leading to increased urination?

Accepted Answer

Antidiuretic hormone (ADH)

Question 10

Which of the following best explains the negative feedback regulation of parathyroid hormone (PTH)?

Accepted Answer

High blood calcium inhibits PTH secretion.

Question 11

A patient with hyperparathyroidism is likely to experience which of the following symptoms?

Accepted Answer

Hypercalcemia and possible kidney stones

Question 12

Which hormone is responsible for stimulating the release of cortisol from the adrenal cortex?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 13

Which of the following is a function of aldosterone?

Accepted Answer

Promotes sodium conservation and potassium excretion by the kidneys

Question 14

Which hormone is secreted by the pancreas to decrease blood glucose levels?

Accepted Answer

Insulin

Question 15

A patient with Type 1 diabetes mellitus is most likely to experience which of the following symptoms?

Accepted Answer

Excessive thirst, frequent urination, and hunger

Question 16

Which hormone is produced by the pineal gland and regulates the sleep/wake cycle?

Accepted Answer

Melatonin

Question 17

Which of the following best describes the role of prostaglandins?

Accepted Answer

They are paracrine chemicals that regulate cellular responses locally and promote inflammation.

Question 18

During a stress response, which pathway leads to increased blood glucose and 'fight or flight' effects?

Accepted Answer

Hypothalamus releases CRH, stimulating anterior pituitary to release ACTH, which stimulates adrenal cortex to release cortisol.

Question 19

Which hormone is responsible for stimulating uterine contractions during childbirth and milk ejection during breastfeeding?

Accepted Answer

Oxytocin (OT)

Question 20

Which of the following factors does NOT directly affect the concentration of a hormone at its target cell?

Accepted Answer

Rate of neurotransmitter release at synapses

The Endocrine System: Structure, Function, and Hormonal Regulation

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