Question 1

Which of the following best describes the primary difference between the nervous system and the endocrine system in terms of signal transmission?

Accepted Answer

The nervous system uses neurotransmitters and electrical impulses for rapid, short-term communication, while the endocrine system uses hormones that travel through the bloodstream for slower, long-lasting effects.

Question 2

A patient is prescribed a high dose of a steroid hormone. Which of the following is a possible consequence of this pharmacological concentration?

Accepted Answer

The hormone may bind to receptors of closely related hormones, causing widespread side effects.

Question 3

Which process describes the increased sensitivity of a target cell to a hormone due to an increased number of receptors?

Accepted Answer

Priming effect (up-regulation)

Question 4

Why are many hormones released in a pulsatile (spurted) manner rather than continuously?

Accepted Answer

To avoid desensitization and downregulation of receptors on target cells

Question 5

Which of the following statements about hormone receptors is correct?

Accepted Answer

Hormone binding to its receptor is highly specific and saturable.

Question 6

Steroid hormones exert their effects by:

Accepted Answer

Binding to nuclear hormone receptors, which act as transcription factors to produce new proteins.

Question 7

Which of the following best describes the mechanism of action for water-soluble hormones?

Accepted Answer

They bind to receptors on the cell surface and activate intracellular second messengers.

Question 8

Which hormone is primarily responsible for stimulating water reabsorption by the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

A tumor in the anterior pituitary gland causing excess ACTH secretion would most likely result in:

Accepted Answer

Increased cortisol production by the adrenal cortex

Question 10

Which layer of the adrenal cortex is responsible for producing mineralocorticoids such as aldosterone?

Accepted Answer

Zona glomerulosa

Question 11

A patient with Addison’s disease is likely to experience which of the following symptoms due to insufficient aldosterone?

Accepted Answer

Low blood pressure and lethargy

Question 12

Which of the following is NOT a function of cortisol?

Accepted Answer

Stimulating uterine contractions during childbirth

Question 13

During the alarm reaction stage of the general adaptation syndrome (GAS), which hormones are released to prepare the body for a 'fight-or-flight' response?

Accepted Answer

Epinephrine and cortisol

Question 14

Chronic stress can lead to which of the following physiological effects?

Accepted Answer

Increased risk of illness due to immune suppression

Question 15

Which of the following best explains why Cushing’s syndrome can result in a 'moon face' and 'buffalo hump'?

Accepted Answer

Chronic high levels of glucocorticoids cause lipolysis and abnormal fat deposition.

Question 16

Which of the following hormones is produced by the anterior pituitary and stimulates the thyroid gland?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 17

Which second messenger system is activated when a hormone binds to a receptor and stimulates the conversion of ATP to cAMP?

Accepted Answer

Adenylate cyclase (cAMP) system

Question 18

Which hormone is released from the posterior pituitary and is primarily involved in stimulating uterine contractions during childbirth?

Accepted Answer

Oxytocin

Question 19

Which of the following best describes the role of the hypothalamus in endocrine regulation?

Accepted Answer

It produces releasing and inhibiting hormones that control the anterior pituitary.

Question 20

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

Accepted Answer

CRH → ACTH → Cortisol

The Endocrine System: Mechanisms, Glands, and Hormonal Regulation

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