Q: Which of the following equations correctly represents the conversion of ATP to cAMP in the second messenger system?

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

Question 1

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands are ductless and secrete hormones directly into the bloodstream, while exocrine glands have ducts that carry nonhormonal secretions to membrane surfaces.

Question 2

A patient presents with symptoms of excessive thirst, huge urine output, and dehydration following a head injury. Which hormone is most likely deficient, and what is the condition called?

Accepted Answer

Antidiuretic hormone (ADH); Diabetes insipidus

Question 3

Which hormone is released in response to low blood calcium levels, and what is its primary action?

Accepted Answer

Parathyroid hormone (PTH); stimulates osteoclasts to release calcium from bone

Question 4

Which of the following is a correct sequence for the cyclic AMP (cAMP) second messenger mechanism?

Accepted Answer

Hormone binds receptor → G protein activates adenylate cyclase → cAMP activates protein kinases

Question 5

A patient with Grave's disease is likely to present with which of the following symptoms?

Accepted Answer

High metabolism, sweating, rapid heartbeat, and exophthalmos

Question 6

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

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 7

Which of the following best explains the concept of 'permissiveness' in hormone interactions?

Accepted Answer

One hormone cannot exert its full effects without another hormone being present.

Question 8

A patient with Cushing's syndrome is likely to have which of the following laboratory findings?

Accepted Answer

Hyperglycemia and elevated blood pressure

Question 9

Which hormone is secreted by the pineal gland and is involved in regulating circadian rhythms?

Accepted Answer

Melatonin

Question 10

Which of the following equations correctly represents the conversion of ATP to cAMP in the second messenger system?

Accepted Answer

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

Question 11

Which hormone is released in response to high blood glucose levels and what is its primary effect?

Accepted Answer

Insulin; lowers blood glucose by enhancing glucose uptake into cells

Question 12

Which of the following is a direct effect of growth hormone (GH) on metabolism?

Accepted Answer

Decreases rate of cellular glucose uptake and increases blood glucose (anti-insulin effect)

Question 13

A patient with Addison's disease is likely to present with which of the following symptoms?

Accepted Answer

Loss of weight, fatigue, hypoglycemia, dehydration, and bronzing of the skin

Question 14

Which hormone is responsible for stimulating milk production in the breasts?

Accepted Answer

Prolactin

Question 15

Which of the following best describes the action of lipid-soluble hormones?

Accepted Answer

They bind to intracellular receptors and directly activate genes.

Question 16

Which hormone is released by the adrenal medulla in response to sympathetic nervous system stimulation?

Accepted Answer

Epinephrine

Question 17

Which of the following is a correct feedback loop involving the hypothalamus, anterior pituitary, and a target endocrine organ?

Accepted Answer

Hypothalamus releases TRH → anterior pituitary releases TSH → thyroid releases thyroid hormone → thyroid hormone inhibits TRH and TSH release

Question 18

Which hormone is most likely to be elevated in a patient with hyperparathyroidism, and what is a common complication?

Accepted Answer

Parathyroid hormone (PTH); hypercalcemia and kidney stones

Question 19

Which hormone is produced by adipose tissue and is involved in regulating energy balance and satiety?

Accepted Answer

Leptin

The Endocrine System: Structure, Function, and Regulation

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