Question 1

Which of the following best describes the main difference between the endocrine and nervous systems in terms of how they regulate body functions?

Accepted Answer

The endocrine system releases hormones into the bloodstream, resulting in slower but longer-lasting effects.

Question 2

A patient presents with extreme thirst and dehydration. Laboratory tests reveal a lack of antidiuretic hormone (ADH) activity. Which condition is most likely present, and what is the physiological explanation?

Accepted Answer

Diabetes insipidus; inability to conserve water due to lack of ADH.

Question 3

Which hormone is produced by the hypothalamus, stored in the posterior pituitary, and is released in response to uterine stretching or infant suckling?

Accepted Answer

Oxytocin

Question 4

Amino-acid based hormones are generally hydrophilic. Where are their receptors most likely to be found?

Accepted Answer

Embedded in the plasma membrane of target cells

Question 5

Which of the following is an example of a negative feedback loop in hormone regulation?

Accepted Answer

Elevated blood glucose stimulates insulin release, which lowers blood glucose and reduces further insulin secretion.

Question 6

Which hormone is secreted by the zona glomerulosa of the adrenal cortex and is primarily responsible for regulating sodium and potassium ion concentrations?

Accepted Answer

Aldosterone

Question 7

A patient with hyperthyroidism is likely to experience which of the following symptoms?

Accepted Answer

Weight loss, heat intolerance, and increased heart rate

Question 8

Which hormone is released in response to decreased blood calcium levels and acts to increase calcium concentration in the blood?

Accepted Answer

Parathyroid hormone (PTH)

Question 9

Which of the following best explains why steroid hormones generally have longer half-lives than amino-acid based hormones?

Accepted Answer

Steroid hormones are bound to plasma proteins, protecting them from rapid degradation.

Question 10

A researcher blocks the hypothalamic-hypophyseal portal system in an experimental animal. Which of the following is most likely to be affected?

Accepted Answer

Delivery of releasing and inhibiting hormones to the anterior pituitary

Question 11

Which hormone is primarily responsible for stimulating the development of ovarian follicles and sperm production?

Accepted Answer

Follicle-stimulating hormone (FSH)

Question 12

A patient is found to have a tumor that causes excessive secretion of growth hormone after the epiphyseal plates have closed. Which condition is most likely to develop?

Accepted Answer

Acromegaly

Question 13

Which of the following best describes the effect of insulin on blood glucose levels?

Accepted Answer

Insulin decreases blood glucose by promoting uptake and storage of glucose.

Question 14

Which hormone is secreted by the pineal gland and is involved in regulating the sleep/wake cycle?

Accepted Answer

Melatonin

Question 15

A patient with an autoimmune disorder produces antibodies that mimic TSH. What is the most likely outcome?

Accepted Answer

Increased production of T3 and T4, leading to hyperthyroidism

Question 16

Which hormone is secreted by the heart in response to increased blood volume and acts to lower blood pressure?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 17

Which of the following best describes the role of the renin-angiotensin-aldosterone system (RAAS) in homeostasis?

Accepted Answer

It increases blood pressure by promoting sodium and water retention.

Question 18

Which hormone is produced by adipose tissue and acts on the hypothalamus to induce satiety?

Accepted Answer

Leptin

Question 19

A patient is unable to absorb dietary calcium due to a lack of active vitamin D. Which hormone is most directly responsible for stimulating the conversion of vitamin D to its active form in the kidneys?

Accepted Answer

Parathyroid hormone (PTH)

Question 20

Which of the following is a correct sequence for the multi-tiered negative feedback control of thyroid hormone production?

Accepted Answer

TRH from hypothalamus → TSH from anterior pituitary → T3/T4 from thyroid gland

Chapter 16: The Endocrine System – Anatomy & Physiology Study Notes

Study Guide - Practice Questions

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