$$H_{hypothalamus} \rightarrow H_{pituitary} \rightarrow H_{gland} \rightarrow \text{Physiological effect} \rightarrow -H_{hypothalamus}$$

Question 1

Which of the following best describes the primary function of hormones in the endocrine system?

Accepted Answer

They serve as cell-to-cell communication molecules that regulate physiological processes.

Question 2

A patient is diagnosed with Grave's disease. Which of the following best explains the underlying mechanism?

Accepted Answer

Autoantibodies activate the TSH receptor, leading to excess thyroid hormone production.

Question 3

Which hormone class is most likely to bind to cell surface receptors and initiate a second messenger cascade?

Accepted Answer

Peptide/protein hormones

Question 4

Which of the following is TRUE regarding steroid hormones?

Accepted Answer

They are derived from cholesterol and typically bind to cytoplasmic or nuclear receptors.

Question 5

A patient presents with symptoms of goiter. Which of the following is the most likely cause?

Accepted Answer

Deficiency of thyroid hormone leading to hypertrophy of the thyroid gland.

Question 6

Which of the following best illustrates the concept of hormone synergism?

Accepted Answer

Glucagon, epinephrine, and cortisol together raise blood glucose to a level greater than the sum of their individual effects.

Question 7

Which of the following equations correctly represents the negative feedback control in an endocrine axis?

Accepted Answer

$$H_{hypothalamus} ightarrow H_{pituitary} ightarrow H_{gland} ightarrow 	ext{Physiological effect} ightarrow -H_{hypothalamus}$$

Question 8

Which of the following is a correct statement about the hypothalamic-hypophyseal portal system?

Accepted Answer

It consists of two capillary beds in series, ensuring direct delivery of hypothalamic hormones to the anterior pituitary.

Question 9

Which of the following is NOT a feature of peptide/protein hormones?

Accepted Answer

They are hydrophobic and can easily cross cell membranes.

Question 10

A patient with acromegaly is most likely experiencing which of the following?

Accepted Answer

Excess growth hormone secretion in adulthood.

Question 11

Which of the following best describes the permissive effect in hormone interactions?

Accepted Answer

One hormone must be present for another hormone to exert its full effect.

Question 12

Which of the following hormones is derived from tyrosine and acts as a catecholamine?

Accepted Answer

Epinephrine

Question 13

Which of the following is TRUE regarding the release of peptide hormones?

Accepted Answer

They are released by Ca++-dependent exocytosis when a signal is received.

Question 14

Which of the following is a correct sequence for the synthesis and release of peptide hormones?

Accepted Answer

Prohormone is synthesized, modified post-translationally, stored in vesicles, and released upon signal.

Question 15

Which of the following best explains why steroid hormones have a longer half-life than peptide hormones?

Accepted Answer

Steroid hormones are lipophilic and bind to plasma proteins, protecting them from rapid degradation.

Question 16

Which of the following is an example of antagonism in hormone interactions?

Accepted Answer

Glucagon opposes the action of insulin in regulating blood glucose.

Question 17

Which of the following is TRUE about the action of steroid hormones?

Accepted Answer

They enter target cells and bind to cytoplasmic or nuclear receptors to activate DNA for protein synthesis.

Question 18

Which of the following best describes the role of the anterior pituitary in the endocrine axis?

Accepted Answer

It is stimulated by hypothalamic releasing hormones and secretes trophic hormones that act on endocrine glands.

Question 19

A patient is given a medication that blocks the action of cAMP in target cells. Which hormone's signaling would be most affected?

Accepted Answer

Peptide/protein hormones that use cAMP as a second messenger

Introduction to the Endocrine System: Structure, Function, and Hormone Classification

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