Q: Which of the following equations best represents the relationship between blood glucose regulation by insulin and glucagon?

$$\Delta [\text{Glucose}] = \text{Glucagon} - \text{Insulin}$$

Question 1

Which of the following best describes the difference between the nervous and endocrine systems in terms of signaling and response time?

Accepted Answer

The nervous system uses electrical signals and neurotransmitters for fast, short-lived responses, while the endocrine system uses hormones for slower, longer-lasting responses.

Question 2

Which gland is NOT considered a major endocrine gland?

Accepted Answer

Pancreas

Question 3

A patient presents with high blood osmolarity and excessive water retention. Which posterior pituitary hormone is most likely involved, and what is its primary target?

Accepted Answer

Antidiuretic hormone (ADH); kidneys

Question 4

Which of the following hormones is released in response to low blood calcium and acts to increase calcium levels by breaking down bone?

Accepted Answer

Parathyroid hormone (PTH)

Question 5

Which chemical class of hormones is most likely to bind to surface receptors and activate second messenger systems?

Accepted Answer

Peptide/protein hormones

Question 6

A patient with Type 1 diabetes mellitus is unable to regulate blood glucose because:

Accepted Answer

Their beta cells are destroyed and cannot produce insulin.

Question 7

Which hormone is released from the adrenal cortex in response to ACTH and is involved in stress adaptation by increasing blood glucose?

Accepted Answer

Cortisol

Question 8

Which feedback mechanism is most common in endocrine regulation and helps maintain homeostasis?

Accepted Answer

Negative feedback

Question 9

If a patient has low levels of T3 and T4, which hormone from the anterior pituitary is likely to be elevated due to feedback mechanisms?

Accepted Answer

TSH

Question 10

Which hormone is secreted by alpha cells of the pancreas and acts to increase blood glucose levels?

Accepted Answer

Glucagon

Question 11

A patient is experiencing symptoms of polyuria, polydipsia, and polyphagia. Their blood glucose is elevated. Which condition is most likely?

Accepted Answer

Type 2 diabetes mellitus

Question 12

Which hormone is released from the posterior pituitary in response to cervical stretch or sucking and stimulates uterine contractions and milk ejection?

Accepted Answer

Oxytocin

Question 13

Which of the following is a function of the endocrine system?

Accepted Answer

Maintaining homeostasis

Question 14

Which hormone is responsible for stimulating the adrenal cortex to release cortisol?

Accepted Answer

ACTH

Question 15

Which of the following equations best represents the relationship between blood glucose regulation by insulin and glucagon?

Accepted Answer

$$\Delta [	ext{Glucose}] = 	ext{Glucagon} - 	ext{Insulin}$$

Question 16

Which hormone is released from the thyroid gland and acts to lower blood calcium levels?

Accepted Answer

Calcitonin

Question 17

A patient with an adrenal medulla tumor is likely to have elevated levels of which hormone, and what is a primary effect?

Accepted Answer

Epinephrine; increased heart rate and sympathetic activation

Question 18

Which hormone is released from the pineal gland and helps regulate sleep/wake cycles?

Accepted Answer

Melatonin

Question 19

Which of the following best describes the role of leptin released from adipose tissue?

Accepted Answer

Suppresses appetite and helps regulate energy balance

Question 20

During a stress response, which sequence correctly describes the long-term pathway for cortisol release?

Accepted Answer

Hypothalamus → CRH → pituitary → ACTH → adrenal cortex → cortisol

Endocrine System: Structure, Function, and Regulation

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