Question 1

Which of the following best describes the anatomical and physiological differences between arteries and veins?

Accepted Answer

Arteries have thicker walls with more smooth muscle and elastic tissue, and carry blood away from the heart; veins have thinner walls, larger lumens, and carry blood toward the heart.

Question 2

A patient is experiencing edema in their lower limbs. Which mechanism of venous return is most likely impaired?

Accepted Answer

The skeletal muscle pump, which helps propel blood in veins toward the heart.

Question 3

Which vessel type is primarily responsible for the exchange of gases, nutrients, and wastes between blood and tissues?

Accepted Answer

Capillaries

Question 4

Calculate the Net Filtration Pressure (NFP) at the arterial end of a capillary given the following values: capillary hydrostatic pressure $$P_c = 35$$ mmHg, interstitial fluid hydrostatic pressure $$P_i = 0$$ mmHg, capillary colloid osmotic pressure $$\pi_c = 26$$ mmHg, and interstitial fluid colloid osmotic pressure $$\pi_i = 1$$ mmHg. Use the formula $$NFP = (P_c - P_i) - (\pi_c - \pi_i).$$

Accepted Answer

$$NFP = (35 - 0) - (26 - 1) = 35 - 25 = 10$$ mmHg

Question 5

Which of the following would most likely increase peripheral resistance and thus decrease blood flow velocity?

Accepted Answer

Vasoconstriction of arterioles

Question 6

Which pressure is always lower than both intrapulmonary and atmospheric pressure during normal inspiration, helping to keep the lungs inflated?

Accepted Answer

Intrapleural pressure

Question 7

A patient stands up quickly and feels dizzy. Which physiological mechanism is responsible for restoring blood pressure in this situation?

Accepted Answer

Baroreceptors in the aortic and carotid sinuses detect the drop in pressure and trigger sympathetic activation to increase heart rate and vasoconstriction.

Question 8

Which of the following is a correct description of the role of the vasa vasorum?

Accepted Answer

They are small arteries that supply blood to the outer layers of large blood vessels.

Question 9

Which of the following best explains why lymphatic capillaries in the digestive tract are called lacteals and why their lymph is known as chyle?

Accepted Answer

Lacteals absorb dietary fats, which make the lymph (chyle) appear milky due to the presence of lipid droplets.

Question 10

Which of the following is NOT a function of the lymphatic system?

Accepted Answer

Transporting oxygen to tissues

Question 11

Which of the following is a mechanical barrier that is part of the first line of nonspecific defense?

Accepted Answer

Skin

Question 12

Which cell type is known as an 'antigen presenter cell' and plays a key role in activating the adaptive immune response?

Accepted Answer

Macrophage

Question 13

Which of the following best describes the difference between the primary and secondary humoral immune responses?

Accepted Answer

The secondary response is faster and more robust due to the presence of memory B cells.

Question 14

Which of the following is the correct reversible chemical equation for the transport of carbon dioxide in the blood?

Accepted Answer

$$CO_2 + H_2O$$ \leftrightarrow H_2CO_3 \leftrightarrow H^+ + $$HCO_3$$^-$$

Question 15

According to Boyle's Law, what happens to the pressure inside the lungs when the volume of the thoracic cavity increases during inspiration?

Accepted Answer

Pressure decreases, causing air to flow into the lungs.

Question 16

Which of the following arteries supplies oxygenated blood to the liver?

Accepted Answer

Hepatic artery

Question 17

Which of the following is the best location to palpate the pulse in an emergency situation?

Accepted Answer

Carotid artery

Question 18

Which of the following factors would most likely cause an increase in mean arterial pressure (MAP)? Use the formula $$MAP = CO 	imes PR$$, where $$CO is $$cardiac output and $$PR is $$peripheral resistance.

Accepted Answer

An increase in both cardiac output and peripheral resistance

Question 19

Which of the following best describes the role of surfactant in the respiratory system?

Accepted Answer

It decreases surface tension in the alveoli, preventing collapse and making breathing easier.

Comprehensive Study Guide: Cardiovascular, Lymphatic, Immune, and Respiratory Systems

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