Question 1

Which of the following best describes the difference in how peptide hormones and steroid hormones interact with their target cells?

Accepted Answer

Peptide hormones bind to receptors on the cell membrane, while steroid hormones 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, and why?

Accepted Answer

T3 and T4, because iodine is essential for their production.

Question 3

Which structure in the brain exerts the most control over the endocrine system, and how does it achieve this?

Accepted Answer

The hypothalamus, by producing releasing and inhibiting hormones that control the pituitary gland.

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

A person with type O negative blood needs a transfusion. Which of the following statements is correct regarding the antigens and antibodies present in their blood?

Accepted Answer

They have no A, B, or Rh antigens on their RBCs and both anti-A and anti-B antibodies in their plasma.

Question 6

Which of the following best explains why red blood cells (erythrocytes) are uniquely suited for their primary function?

Accepted Answer

They lack a nucleus, maximizing space for hemoglobin and increasing oxygen-carrying capacity.

Question 7

A patient presents with fatigue and joint pain. Blood analysis reveals abnormally shaped red blood cells. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Sickle cell anemia, caused by a mutation in the hemoglobin gene.

Question 8

Which of the following best describes the flow of blood through the heart, starting at the vena cavae?

Accepted Answer

Vena cavae → right atrium → right ventricle → pulmonary trunk → pulmonary arteries → lungs → pulmonary veins → left atrium → left ventricle → aorta

Question 9

Which of the following statements about the pericardium is correct?

Accepted Answer

The pericardium consists of a fibrous outer layer and a serous inner layer that protects and anchors the heart.

Question 10

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 11

A patient has a blood pressure of 140/90 mmHg. If their arterioles undergo vasoconstriction, what is the expected effect on their blood pressure, and why?

Accepted Answer

Blood pressure will increase because vasoconstriction decreases vessel diameter, increasing resistance.

Question 12

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 pressure fluctuations, while muscular arteries distribute blood to specific organs.

Question 13

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

Accepted Answer

Hydrostatic pressure

Question 14

Baroreceptors play a critical role in regulating blood pressure. Where are they primarily located, and what type of stimulus do they detect?

Accepted Answer

In the carotid sinuses and aortic arch; they detect changes in blood pressure (stretch).

Question 15

Which of the following is the most abundant type of white blood cell in a normal blood sample, and what is its primary function?

Accepted Answer

Neutrophil; phagocytosis of bacteria and debris.

Question 16

Which hormone is released by the pineal gland, and what is its primary function?

Accepted Answer

Melatonin; regulating circadian rhythms and sleep-wake cycles.

Question 17

Which of the following equations correctly represents the relationship between blood flow ($$F$$), pressure difference ($$\Delta P$$), and resistance ($$R) in a $$blood vessel?

Accepted Answer

$$F = \Delta P / R$$

Question 18

Which of the following best describes the main function of calcitonin?

Accepted Answer

It decreases blood calcium levels by inhibiting osteoclast activity and increasing calcium excretion by the kidneys.

Question 19

A patient is experiencing excessive bleeding after a minor injury. Laboratory tests reveal a low platelet count. Which formed element is deficient, and what is its technical name?

Accepted Answer

Platelets; thrombocytes

Question 20

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

Accepted Answer

They regulate the secretion of hormones from the anterior pituitary gland.

Unit 4 ANP Study Guide: Endocrine, Blood, Heart, and Blood Vessels

Study Guide - Practice Questions

Study Guide - Flashcards