Question 1

Which of the following best describes the primary function of the hepatic portal system?

Accepted Answer

It carries nutrient-rich blood from the digestive tract to the liver for processing.

Question 2

A patient has a blockage in a coronary artery. Why is this considered especially dangerous?

Accepted Answer

It prevents oxygenated blood from reaching the heart muscle, leading to tissue death.

Question 3

Which equation best represents the relationship between blood flow ($Q$), pressure difference ($\Delta P$), and resistance ($R$) in a vessel?

Accepted Answer

$Q = \Delta P / R$

Question 4

How do capillaries primarily move molecules in and out of the bloodstream?

Accepted Answer

By bulk flow driven by pressure gradients.

Question 5

Which of the following is TRUE about fetal circulation compared to adult circulation?

Accepted Answer

Fetal blood bypasses the liver and lungs through special shunts.

Question 6

Which structure is responsible for regulating the fluid balance around cells in tissues?

Accepted Answer

Lymphatic system

Question 7

A patient presents with swollen lymph nodes. What is the most likely physiological explanation?

Accepted Answer

Accumulation of lymph due to infection or inflammation.

Question 8

Why does blood velocity decrease as it enters the capillary beds?

Accepted Answer

Because the total cross-sectional area of capillaries is much greater than that of arteries.

Question 9

Which of the following best explains why veins and arteries are usually paired together in the body?

Accepted Answer

To ensure that blood can return to the heart efficiently and maintain temperature regulation.

Question 10

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

Accepted Answer

Producing red blood cells.

Question 11

A patient has increased net bulk flow out of capillaries. Which equation best describes net bulk flow ($J$) in terms of hydrostatic pressure ($P_h$) and osmotic pressure ($P_o$)?

Accepted Answer

$J = P_h - P_o$

Question 12

Which of the following best describes the distribution of lymph glands (nodes) throughout the body?

Accepted Answer

They are clustered in regions such as the neck, armpits, and groin.

Question 13

Which vessel type is primarily responsible for controlling blood pressure by changing its diameter?

Accepted Answer

Arteries

Question 14

Which of the following is a major difference between arteries and veins?

Accepted Answer

Arteries have thicker muscular walls to withstand higher pressure.

Question 15

Which of the following best describes a capillary bed?

Accepted Answer

A network of small blood vessels where exchange of gases, nutrients, and waste occurs.

Question 16

If the pressure entering a capillary bed increases, what is the most likely effect on net bulk flow?

Accepted Answer

Net bulk flow out of the capillaries will increase.

Question 17

Which of the following is a correct statement about the pulmonary circuit?

Accepted Answer

It transports deoxygenated blood from the heart to the lungs.

Question 18

A newborn is diagnosed with a patent ductus arteriosus (PDA). What is the consequence of this condition?

Accepted Answer

Oxygenated and deoxygenated blood mix, reducing oxygen delivery to tissues.

Question 19

Which of the following is the main function of the lymph node network?

Accepted Answer

To filter lymph and trap pathogens.

Question 20

Which of the following best explains why blood pressure is higher in arteries than in veins?

Accepted Answer

Arteries are closer to the heart and receive blood directly from ventricular contraction.

Cardiovascular and Lymphatic Systems: Structure, Function, and Circulation

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