Q: Which of the following equations correctly represents the half-life decay of a hormone in the bloodstream?

$$C_t = C_0$ \times (\frac{1}{2}$$)^{t/T_{1/2}$$}$$

Question 1

Which of the following best explains why steroid hormones can directly activate genes inside a target cell?

Accepted Answer

Steroid hormones are lipid-soluble and can diffuse through the cell membrane to bind intracellular receptors.

Question 2

A patient presents with symptoms of muscle weakness and abnormal neuron function. Laboratory tests reveal excessive excretion of potassium ($$K^+) in $$the urine. Which hormone imbalance is most likely responsible?

Accepted Answer

Excessive secretion of aldosterone

Question 3

Which of the following is a correct sequence for the cAMP (cyclic AMP) signaling mechanism in water-soluble hormone action?

Accepted Answer

Hormone binds receptor → G-protein activates adenylate cyclase → cAMP produced → Protein kinase activated

Question 4

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

Accepted Answer

Excessive thirst and large volumes of dilute urine

Question 5

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

Accepted Answer

Endocrine glands secrete hormones into the bloodstream; exocrine glands secrete non-hormonal substances into ducts.

Question 6

Which hormone is released in response to low blood calcium ($$Ca^{2+}) $$levels, and what is its primary effect?

Accepted Answer

Parathyroid hormone (PTH); increases osteoclast activity to release $$Ca^{2+}$$ from bone

Question 7

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

Accepted Answer

Hyperglycemia and increased blood sodium ($$Na^+)$$

Question 8

Which of the following best explains the role of insulin in glucose homeostasis?

Accepted Answer

Insulin stimulates glucose uptake in tissue cells and glycogen formation in the liver, lowering blood glucose levels.

Question 9

Which of the following is a correct description of the hypothalamic-pituitary-adrenal (HPA) axis response to chronic stress?

Accepted Answer

The hypothalamus releases CRH, stimulating the anterior pituitary to release ACTH, which stimulates the adrenal cortex to release cortisol.

Question 10

Which of the following equations correctly represents the half-life decay of a hormone in the bloodstream?

Accepted Answer

$$C_t = C_0$ 	imes (\frac{1}{2}$$)^{t/T_{1/2}$$}$$

Question 11

A patient with hyperparathyroidism is at increased risk for which of the following complications?

Accepted Answer

Kidney stones and bone softening due to hypercalcemia

Question 12

Which hormone is primarily responsible for stimulating ovulation and promoting testosterone production?

Accepted Answer

Luteinizing hormone (LH)

Question 13

Which of the following best describes the effect of antidiuretic hormone (ADH) on the kidneys?

Accepted Answer

ADH increases water reabsorption in kidney tubules, reducing urine output.

Question 14

Which of the following is a correct match between hormone and its primary function?

Accepted Answer

Aldosterone; promotes sodium ($$Na^+) $$retention and potassium ($$K^+) $$excretion

Question 15

Which of the following mechanisms is used by water-soluble hormones to exert their effects on target cells?

Accepted Answer

Activation of second messenger systems such as cAMP and Ca$$^{2+}$$

Question 16

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

Accepted Answer

Hypoglycemia, dehydration, and hypotension

Question 17

Which of the following best explains the permissiveness effect in hormone interactions?

Accepted Answer

One hormone is needed for another hormone to be fully effective.

Question 18

Which of the following is a correct description of the renin-angiotensin-aldosterone (RAA) mechanism?

Accepted Answer

Low blood volume stimulates the kidneys to release renin, which leads to aldosterone secretion and increased blood pressure.

Question 19

Which of the following best describes the effect of glucagon during the fasted state?

Accepted Answer

Glucagon stimulates glycogen breakdown in the liver, increasing blood glucose levels.

The Endocrine System: Structure, Function, and Hormonal Regulation

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