Q: Which of the following equations correctly represents the negative feedback regulation of thyroid hormone production?

$$TRH \rightarrow TSH \rightarrow T_3$/T_4$ \rightarrow \text{inhibition of TRH and TSH}$$

Question 1

Which of the following best describes the primary function of thyroid hormones (T3 and T4) in the human body?

Accepted Answer

Regulation of metabolic rate and thermoregulation

Question 2

A patient presents with weight loss, heat intolerance, increased blood pressure, and a goiter. Laboratory tests reveal elevated levels of thyroid hormones. Which condition is most likely responsible for these symptoms?

Accepted Answer

Grave's disease

Question 3

Which cell type in the pancreas is responsible for secreting insulin?

Accepted Answer

Beta (β) cells

Question 4

What is the main physiological effect of calcitonin secreted by the thyroid gland?

Accepted Answer

Decrease blood calcium levels by inhibiting osteoclasts

Question 5

Which hormone is secreted by the parathyroid glands in response to hypocalcemia, and what is its primary action?

Accepted Answer

Parathyroid hormone (PTH); increases blood calcium by stimulating osteoclasts

Question 6

A patient with Type 1 diabetes mellitus is unable to take up glucose into cells. Which of the following best explains the underlying cause?

Accepted Answer

Autoimmune destruction of pancreatic β cells

Question 7

Which of the following equations correctly represents the negative feedback regulation of thyroid hormone production?

Accepted Answer

$$TRH ightarrow TSH ightarrow T_3$/T_4$ ightarrow 	ext{inhibition of TRH and TSH}$$

Question 8

Which hormone is secreted by the pineal gland and what is its primary physiological role?

Accepted Answer

Melatonin; regulation of sleep-wake cycles

Question 9

A patient with hypothyroidism due to iodine deficiency is likely to present with which of the following symptoms?

Accepted Answer

Weight gain, cold intolerance, bradycardia

Question 10

Which of the following best describes the antagonistic relationship between insulin and glucagon in blood glucose regulation?

Accepted Answer

Insulin decreases blood glucose, glucagon increases blood glucose

Question 11

Which hormone is secreted by adipose tissue and what is its effect on the hypothalamus?

Accepted Answer

Leptin; increases satiety and prevents overeating

Question 12

Which of the following is a direct effect of parathyroid hormone (PTH) on the kidneys?

Accepted Answer

Increase tubular reabsorption of calcium

Question 13

Which process is stimulated by glucagon in the liver to increase blood glucose levels?

Accepted Answer

Glycogenolysis

Question 14

Atrial natriuretic peptide (ANP) is secreted in response to increased blood volume. What is its primary effect on the kidneys?

Accepted Answer

Promotes excretion of sodium and water (natriuresis)

Question 15

Testosterone exerts its effects by binding to intracellular receptors and influencing gene expression. Which of the following is NOT a basic effect of testosterone?

Accepted Answer

Regulation of blood calcium levels

Question 16

Which hormone is secreted by the kidneys in response to low blood oxygen and what is its target tissue?

Accepted Answer

Erythropoietin (EPO); red bone marrow

Question 17

Which of the following best explains why most thyroid hormone released into the blood is T4 rather than T3?

Accepted Answer

T4 has a longer half-life and can be converted to T3 in tissues

Question 18

Which of the following equations represents the conversion of T4 to T3 in peripheral tissues?

Accepted Answer

$$T_4$$ \xrightarrow{deiodinase} $$T_3$$

Question 19

Which hormone is secreted by the thymus and what is its primary function?

Accepted Answer

Thymosin; maturation of T lymphocytes

Question 20

Which of the following is a consequence of unopposed glucagon action in Type 1 diabetes mellitus?

Accepted Answer

Increased hepatic glucose production and hyperglycemia

Endocrine Glands: Thyroid, Pancreas, and Other Hormone-Secreting Tissues 18

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