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

$$\text{Hormone} \rightarrow \text{Receptor} \rightarrow cAMP \rightarrow \text{Cellular response}$$

Question 1

Which of the following best describes the difference between endocrine and neural signaling in terms of speed and duration of response?

Accepted Answer

Endocrine signaling is generally slower and longer-lasting than neural signaling.

Question 2

A patient presents with symptoms of hyperthyroidism. Which hormone is most likely to be elevated in their blood?

Accepted Answer

Thyroid hormones (T3 and T4)

Question 3

Which of the following is a peptide hormone?

Accepted Answer

Insulin

Question 4

A patient with Addison’s disease is experiencing low blood pressure and fatigue. Which hormone is most likely deficient?

Accepted Answer

Aldosterone

Question 5

Which equation best represents the negative feedback regulation of thyroid hormone secretion?

Accepted Answer

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

Question 6

Which of the following is a primary effect of parathyroid hormone (PTH) on bone tissue?

Accepted Answer

Increase in bone resorption

Question 7

A patient has a tumor in the anterior pituitary that causes excess ACTH secretion. What is the most likely consequence?

Accepted Answer

Increased cortisol production

Question 8

Which hormone is secreted by the posterior pituitary and is primarily responsible for water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

Which of the following best describes the role of thyroid-binding globulin (TBG)?

Accepted Answer

It transports thyroid hormones in the blood.

Question 10

A patient with Type 1 Diabetes Mellitus is unable to produce which hormone?

Accepted Answer

Insulin

Question 11

Which of the following is a correct sequence for the hypothalamic-pituitary-adrenal (HPA) axis?

Accepted Answer

$$CRH \rightarrow ACTH \rightarrow Cortisol$$

Question 12

Which hormone is primarily responsible for stimulating ovulation in females?

Accepted Answer

Luteinizing hormone (LH)

Question 13

Which of the following is a major function of melatonin secreted by the pineal gland?

Accepted Answer

Regulation of sleep-wake cycles

Question 14

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

Accepted Answer

Hypocalcemia

Question 15

Which of the following is a steroid hormone?

Accepted Answer

Cortisol

Question 16

Which of the following best explains the effect of a hormone binding to a plasma binding protein?

Accepted Answer

It increases the hormone's half-life and availability.

Question 17

A patient with Cushing’s disease has excess glucocorticoids. Which of the following is a likely symptom?

Accepted Answer

Muscle wasting

Question 18

Which of the following is a correct example of a second messenger system used by peptide hormones?

Accepted Answer

$$	ext{Hormone} ightarrow 	ext{Receptor} ightarrow cAMP ightarrow 	ext{Cellular response}$$

Question 19

Which hormone is secreted by the alpha cells of the pancreas and increases blood glucose levels?

Accepted Answer

Glucagon

Question 20

A patient is diagnosed with secondary hypothyroidism. Which of the following is most likely deficient?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Endocrine and Reproductive System: Structured Study Notes

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