Question 1

Which of the following best describes the main structural difference between arteries and veins as seen in histological cross-section?

Accepted Answer

Arteries have a thicker tunica media and a narrower lumen compared to veins.

Question 2

A patient presents with swelling in the lower limbs due to blood pooling in superficial veins. Which vascular structure is most likely malfunctioning?

Accepted Answer

Venous valves

Question 3

Which type of capillary would you expect to find in the liver, and why?

Accepted Answer

Sinusoid capillaries, because they are highly permeable and allow passage of large molecules and cells.

Question 4

During vigorous exercise, blood flow is redirected to skeletal muscles. Which mechanism is primarily responsible for this redistribution?

Accepted Answer

Vasodilation of arteries supplying skeletal muscle and vasoconstriction of arteries supplying digestive organs

Question 5

Which equation correctly represents the relationship between blood flow ($$F$$), pressure gradient ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \Delta P / R$$

Question 6

A patient has a blood pressure of 150/90 mmHg. What is their pulse pressure, and what does an elevated pulse pressure indicate?

Accepted Answer

Pulse pressure is 60 mmHg; it indicates stiffer arteries and possible arteriosclerosis.

Question 7

Which of the following best explains why blood flow velocity is slowest in capillaries?

Accepted Answer

Capillaries have the largest total cross-sectional area, allowing more time for exchange.

Question 8

Which process is primarily responsible for the movement of water and dissolved solutes from the capillaries into the surrounding tissue at the arterial end?

Accepted Answer

Filtration due to hydrostatic pressure

Question 9

Which of the following is a correct description of the portal system?

Accepted Answer

It is a network where blood flows from one capillary bed to another before returning to the heart.

Question 10

A patient with arteriosclerosis is likely to experience which of the following changes in their cardiovascular system?

Accepted Answer

Increased resistance and restricted blood flow due to stiffened arteries

Question 11

Which of the following best describes the function of precapillary sphincters in a capillary bed?

Accepted Answer

They control blood flow into the capillary bed based on tissue needs.

Question 12

Which of the following is a major risk associated with untreated hypertension?

Accepted Answer

Heart failure, stroke, and kidney failure

Question 13

Which of the following is the primary reason why veins in the lower limbs require valves?

Accepted Answer

To prevent backflow of blood due to gravity

Question 14

Which of the following best describes the effect of vasoconstriction on blood pressure and flow?

Accepted Answer

Increases resistance and raises blood pressure

Question 15

Which hormone is released in response to low blood pressure and acts to increase blood pressure by vasoconstriction and increasing blood volume?

Accepted Answer

Renin-angiotensin system hormones

Question 16

Which of the following is a correct sequence of blood flow through the systemic circulation?

Accepted Answer

Artery → Capillary → Vein → Heart

Question 17

Which of the following best explains why the pulmonary circulation has lower blood pressure than the systemic circulation?

Accepted Answer

The pulmonary circuit has less resistance due to shorter vessel length.

Question 18

Which of the following is the main function of the hepatic portal system?

Accepted Answer

To transport nutrient-rich blood from the gastrointestinal tract to the liver for detoxification and metabolism

Question 19

Which of the following is a correct definition of angiogenesis?

Accepted Answer

The formation of new blood vessels from pre-existing vessels

Question 20

A patient is diagnosed with atherosclerosis. Which of the following best describes this condition?

Accepted Answer

A buildup of plaque inside arterial walls leading to stiffening and narrowing of arteries

Blood Vessels and Circulation: Structure, Function, and Regulation

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