Q: Which equation represents the relationship between hormone concentration and target cell response?

$$Response = k \times [Hormone]$$

Question 1

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

Accepted Answer

The nervous system acts at specific locations determined by axon pathways, while the endocrine system acts at diffuse locations where blood reaches.

Question 2

A patient is experiencing symptoms of excessive thirst and frequent urination. Laboratory tests reveal high blood glucose levels. Which endocrine organ is most likely malfunctioning?

Accepted Answer

Pancreas

Question 3

Which of the following hormones is primarily responsible for regulating blood calcium levels?

Accepted Answer

Parathyroid hormone

Question 4

Which statement correctly describes the mechanism of action for steroid hormones?

Accepted Answer

They bind to intracellular receptors and directly activate specific genes.

Question 5

A hormone's effect on a target cell depends on several factors. Which of the following is NOT one of those factors?

Accepted Answer

The size of the target cell

Question 6

Which feedback mechanism is most commonly used to maintain homeostasis in the endocrine system?

Accepted Answer

Negative feedback

Question 7

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

Accepted Answer

It produces hormones that are stored and released by the posterior pituitary.

Question 8

Which equation best represents the calculation of hormone half-life?

Accepted Answer

$$t_{1/2} = \frac{0.693}{k}$$

Question 9

A patient with Cushing's syndrome is likely to have excess levels of which hormone?

Accepted Answer

Glucocorticoids

Question 10

Which of the following is an example of a hormone acting via a second messenger system?

Accepted Answer

Epinephrine binding to a cell surface receptor and activating cAMP

Question 11

Which type of gland releases its secretions into ducts that lead to body surfaces?

Accepted Answer

Exocrine gland

Question 12

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

Accepted Answer

Melatonin

Question 13

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

Accepted Answer

One hormone amplifies the effect of another hormone on the same target cell.

Question 14

Which hormone is produced by the adrenal cortex and is involved in electrolyte balance?

Accepted Answer

Aldosterone

Question 15

Which of the following is a correct statement about water-soluble hormones?

Accepted Answer

They circulate in the blood without carriers.

Question 16

A patient is given a drug that blocks adenylate cyclase activity. Which hormone signaling pathway would be most affected?

Accepted Answer

cAMP second messenger pathway

Question 17

Which of the following is NOT a major endocrine organ?

Accepted Answer

Sebaceous gland

Question 18

Which hormone is released in response to low blood volume and stimulates the kidneys to reabsorb water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 19

Which of the following best describes the effect of insulin?

Accepted Answer

Lowers blood glucose levels

Question 20

Which equation represents the relationship between hormone concentration and target cell response?

Accepted Answer

$$Response = k 	imes [Hormone]$$

Endocrine System: Structure, Function, and Regulation

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