Question 1

Which of the following best describes a key difference between the endocrine system and the nervous system?

Accepted Answer

The nervous system uses neurotransmitters for fast, targeted responses, while the endocrine system uses hormones for slower, widespread effects.

Question 2

Which of the following is NOT a structural class of hormones?

Accepted Answer

Carbohydrate hormones

Question 3

A target cell for a hormone is defined as:

Accepted Answer

A cell that contains specific receptors for a particular hormone

Question 4

Which of the following best explains how peptide hormones amplify their effects in target cells?

Accepted Answer

By binding to membrane receptors and activating second messenger systems such as $$cAMP or$$ $$Ca^{2+}$$, leading to signal amplification

Question 5

Which of the following is a correct example of a second messenger activated by hormone-receptor interaction?

Accepted Answer

$$cAMP$$

Question 6

Which of the following is NOT one of the three types of endocrine gland stimuli?

Accepted Answer

Mechanical stimulus

Question 7

A patient is given a medication that mimics the action of cortisol. Which feedback mechanism is most likely to be affected?

Accepted Answer

Negative feedback, leading to decreased ACTH release from the anterior pituitary

Question 8

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

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

Which of the following symptoms is most likely associated with hypersecretion of parathyroid hormone (PTH)?

Accepted Answer

Bone demineralization and elevated blood calcium levels

Question 10

Which hormone is primarily responsible for increasing blood glucose levels during fasting?

Accepted Answer

Glucagon

Question 11

Which of the following is a correct example of a permissive hormonal interaction?

Accepted Answer

Thyroid hormone increases the number of receptors for epinephrine on target cells, enhancing the effect of epinephrine

Question 12

A patient presents with symptoms of hypothyroidism. Which feedback mechanism is most likely impaired?

Accepted Answer

Negative feedback involving low levels of thyroid hormone and increased TSH release

Question 13

Which hormone is secreted by the pineal gland and regulates circadian rhythms?

Accepted Answer

Melatonin

Question 14

Which of the following is a secondary endocrine organ?

Accepted Answer

Kidneys

Question 15

Which hormone is released in response to stress and is involved in the 'alarm' stage of the general adaptation syndrome?

Accepted Answer

Cortisol

Question 16

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

Accepted Answer

They bind to intracellular receptors and directly regulate gene transcription

Question 17

Which hormone is released from the adrenal medulla in response to neural stimulus and prepares the body for 'fight or flight'?

Accepted Answer

Epinephrine

Question 18

Which of the following is a correct example of an antagonistic hormonal interaction?

Accepted Answer

Insulin lowers blood glucose while glucagon raises it

Question 19

A patient with a tumor in the anterior pituitary is found to have elevated levels of ACTH. Which organ is most likely to show increased hormone production as a result?

Accepted Answer

Adrenal cortex

Question 20

Which of the following best describes the role of G protein-coupled receptors in hormone signaling?

Accepted Answer

They activate intracellular second messengers such as $$cAMP or$$ $$Ca^{2+}$$ upon hormone binding

Endocrine System: Hormones, Mechanisms, and Regulation

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