Question 1

Which of the following best describes the difference between peptide hormones and steroid hormones in terms of their mechanism of action?

Accepted Answer

Peptide hormones bind to receptors on the cell membrane and activate second messenger systems, while steroid hormones diffuse through the cell membrane and bind to intracellular receptors.

Question 2

A patient is diagnosed with hypothyroidism due to a lack of dietary iodine. Which hormone(s) will be directly affected in their synthesis?

Accepted Answer

T3 (triiodothyronine) and T4 (thyroxine)

Question 3

Which structure in the brain exerts the most control over the endocrine system by regulating the pituitary gland?

Accepted Answer

Hypothalamus

Question 4

Which of the following best describes the hypophyseal portal system?

Accepted Answer

A network of capillaries that carries hormones from the hypothalamus directly to the anterior pituitary.

Question 5

Which gland releases melatonin, and what is the primary function of this hormone?

Accepted Answer

Pineal gland; regulates circadian rhythms

Question 6

A patient with sickle cell anemia has a mutation affecting which component of their blood?

Accepted Answer

Hemoglobin in red blood cells

Question 7

Which of the following is the technical name for a red blood cell?

Accepted Answer

Erythrocyte

Question 8

A person with type B blood receives type A blood in a transfusion. What will most likely occur and why?

Accepted Answer

Agglutination, because type B blood has anti-A antibodies that will bind to A antigens on the donor RBCs.

Question 9

Which of the following best describes the main function of white blood cells?

Accepted Answer

Defend the body against pathogens and foreign substances

Question 10

Which layer of the heart wall is responsible for the contraction of the heart?

Accepted Answer

Myocardium

Question 11

Blood returning from the body enters the heart through which vessel, and into which chamber does it flow first?

Accepted Answer

Vena cavae; right atrium

Question 12

Which of the following best describes the function of intercalated discs in cardiac muscle?

Accepted Answer

They allow rapid transmission of electrical impulses and strong mechanical connections between cardiac cells.

Question 13

Which of the following best describes the difference between elastic arteries and muscular arteries?

Accepted Answer

Elastic arteries are closer to the heart and help dampen the pressure fluctuations from the heartbeat, while muscular arteries distribute blood to specific organs.

Question 14

What is the effect of vasoconstriction on blood pressure, and which equation best represents the relationship between blood flow, pressure, and resistance?

Accepted Answer

Vasoconstriction increases blood pressure; $$Q = \frac{\Delta P}{R}$$

Question 15

Which force is primarily responsible for pushing fluid out of capillaries into the surrounding tissues?

Accepted Answer

Hydrostatic pressure

Question 16

Baroreceptors are located in the carotid sinuses and aortic arch. What is their primary function?

Accepted Answer

Monitor blood pressure and initiate reflexes to maintain homeostasis

Question 17

Which of the following best describes the role of releasing and inhibiting hormones?

Accepted Answer

They are produced by the hypothalamus to regulate hormone secretion from the anterior pituitary.

Question 18

Which of the following is the most abundant white blood cell in a normal blood sample?

Accepted Answer

Neutrophil

Question 19

A patient is experiencing high blood calcium levels. Which hormone is most likely to be secreted to lower blood calcium, and what is its effect?

Accepted Answer

Calcitonin; increases calcium deposition in bones

Question 20

Which of the following best describes the function of capillaries?

Accepted Answer

They are the site of exchange of gases, nutrients, and wastes between blood and tissues.

Unit 4 ANP Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

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