Q: A researcher is studying the feedback regulation of cortisol. Which equation best represents the negative feedback loop involving the hypothalamic-pituitary-adrenal (HPA) axis?

$$CRH \rightarrow ACTH \rightarrow Cortisol \rightarrow \text{inhibition of CRH and ACTH}$$

Q: Which equation best represents the synergistic effect of hormone interactions?

$$\text{Effect of A} + \text{Effect of B} \u003c \text{Effect of A+B}$$

Question 1

Which of the following is NOT a characteristic required for a chemical to be classified as a hormone?

Accepted Answer

It must be secreted by neurons into synaptic clefts.

Question 2

A patient presents with symptoms of hypothyroidism. Laboratory tests reveal low levels of thyroid hormones but elevated levels of thyroid-stimulating hormone (TSH). Which endocrine gland is most likely functioning abnormally?

Accepted Answer

Thyroid gland

Question 3

Steroid hormones are synthesized from which precursor molecule?

Accepted Answer

Cholesterol

Question 4

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

Accepted Answer

They bind to cell surface receptors and activate second messenger pathways.

Question 5

A researcher is studying the feedback regulation of cortisol. Which equation best represents the negative feedback loop involving the hypothalamic-pituitary-adrenal (HPA) axis?

Accepted Answer

$$CRH ightarrow ACTH ightarrow Cortisol ightarrow 	ext{inhibition of CRH and ACTH}$$

Question 6

Which hormone is synthesized as a preprohormone, processed in the endoplasmic reticulum and Golgi apparatus, and stored in vesicles before secretion?

Accepted Answer

Insulin

Question 7

Which of the following statements about the anterior pituitary gland is TRUE?

Accepted Answer

It synthesizes and secretes hormones in response to hypothalamic releasing hormones.

Question 8

A patient with a tumor in the adrenal cortex is producing excess cortisol. What effect would this have on the levels of ACTH and CRH?

Accepted Answer

ACTH would decrease and CRH would decrease due to negative feedback.

Question 9

Which of the following hormones is derived from a single amino acid?

Accepted Answer

Epinephrine

Question 10

Which equation best represents the synergistic effect of hormone interactions?

Accepted Answer

$$	ext{Effect of A} + 	ext{Effect of B} \u003c 	ext{Effect of A+B}$$

Question 11

Which of the following is a direct effect of growth hormone (GH) released from the anterior pituitary?

Accepted Answer

Promotion of protein synthesis and tissue growth

Question 12

Which pathway correctly describes the release of hormones from the hypothalamus to the anterior pituitary?

Accepted Answer

Releasing hormones travel through the portal system to stimulate hormone secretion from the anterior pituitary.

Question 13

Which of the following is TRUE regarding steroid hormone transport in the blood?

Accepted Answer

Steroid hormones are bound to plasma proteins for transport.

Question 14

A patient is given a drug that blocks all cell surface hormone receptors. Which hormone would be LEAST affected by this drug?

Accepted Answer

Cortisol

Question 15

Which of the following best describes the role of the hypothalamic-pituitary portal system?

Accepted Answer

It transports releasing hormones from the hypothalamus directly to the anterior pituitary.

Question 16

Which of the following is an example of a complex endocrine pathway involving multiple levels of feedback?

Accepted Answer

Cortisol regulation via the hypothalamic-pituitary-adrenal axis

Question 17

Which hormone is released from the posterior pituitary and is involved in water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 18

Which of the following statements about hormone interactions is CORRECT?

Accepted Answer

Synergistic hormones produce a combined effect greater than the sum of their individual effects.

Question 19

Which of the following is a peptide hormone that regulates blood glucose levels?

Accepted Answer

Insulin

Question 20

A patient with damage to the posterior pituitary would most likely have problems with which physiological process?

Accepted Answer

Water balance and uterine contractions

Introduction to the Endocrine System: Hormones, Pathways, and Interactions

Guida di studio - Domande di pratica

Study guide - Flashcard