Q: Which of the following equations correctly represents the calculation of metabolic clearance rate (MCR) for a hormone?

$$\text{MCR} = \frac{\text{Amount of hormone removed}}{\text{Time}}$$

Question 1

Which hormone is secreted by the pineal gland at night and is involved in regulating the circadian rhythm?

Accepted Answer

Melatonin

Question 2

A patient presents with symptoms of polyuria, polydipsia, and polyphagia. Laboratory tests reveal hyperglycemia and glycosuria. Which hormone is most likely deficient?

Accepted Answer

Insulin

Question 3

Which of the following best describes the mechanism of action for steroid hormones?

Accepted Answer

They diffuse through the plasma membrane and bind to intracellular receptors.

Question 4

Which hormone is released by the parathyroid glands in response to low blood calcium levels, and what is its primary effect?

Accepted Answer

Parathyroid hormone (PTH); increases blood calcium

Question 5

A person on a very low carbohydrate diet is likely to have increased secretion of which pancreatic hormone?

Accepted Answer

Glucagon

Question 6

Which of the following is a long-term complication of poorly controlled diabetes mellitus?

Accepted Answer

Heart and kidney disease

Question 7

Which hormone is secreted by the heart in response to increased blood pressure and acts to decrease blood volume?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 8

Which of the following best explains why water-soluble hormones cannot enter target cells directly?

Accepted Answer

They are repelled by the hydrophobic core of the plasma membrane.

Question 9

A patient with an autoimmune destruction of pancreatic β cells is most likely to develop which condition?

Accepted Answer

Type I diabetes mellitus

Question 10

Which of the following equations correctly represents the calculation of metabolic clearance rate (MCR) for a hormone?

Accepted Answer

$$	ext{MCR} = \frac{	ext{Amount of hormone removed}}{	ext{Time}}$$

Question 11

Which hormone is primarily responsible for stimulating the development of T-cells in the thymus?

Accepted Answer

Thymosin

Question 12

Which of the following best describes the effect of enzyme amplification in hormone signaling?

Accepted Answer

A small amount of hormone produces a large physiological effect.

Question 13

Which of the following is a paracrine secretion involved in allergic reactions and vasodilation?

Accepted Answer

Histamine

Question 14

A patient is experiencing hypoglycemia, weakness, and hunger after an insulin injection. Which hormone(s) would be secreted in response to this state?

Accepted Answer

Epinephrine, growth hormone, and glucagon

Question 15

Which of the following best explains why gestational diabetes occurs during pregnancy?

Accepted Answer

Placental hormones deactivate insulin receptors

Question 16

Which hormone is secreted by the ovaries and is responsible for regulating the menstrual cycle and preparing the mammary glands for lactation?

Accepted Answer

Estrogen and progesterone

Question 17

Which of the following best describes the feedback mechanism controlling thyroid hormone levels?

Accepted Answer

Negative feedback inhibition

Question 18

Which of the following drugs would most likely inhibit the synthesis of prostaglandins and reduce inflammation?

Accepted Answer

Aspirin

Question 19

Which of the following best describes the process of up-regulation in hormone signaling?

Accepted Answer

An increase in receptor density increases target cell sensitivity

Question 20

Which of the following is a correct sequence of events for the action of a water-soluble hormone?

Accepted Answer

Hormone binds to cell-surface receptor $$\rightarrow$$ activation of second messenger $$\rightarrow$$ cellular response

Other Endocrine Glands and Hormone Physiology

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