Question 1

Which of the following best describes the main structural difference between arteries and veins?

Accepted Answer

Arteries have thicker walls and more elastic tissue than veins.

Question 2

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

Accepted Answer

Capillaries

Question 3

A patient is diagnosed with varicose veins. Which of the following best explains the underlying cause?

Accepted Answer

Valves in veins become incompetent, allowing blood to pool.

Question 4

Which of the following equations correctly represents the relationship between blood flow (F), pressure difference (ΔP), and resistance (R)?

Accepted Answer

$$F = \Delta P / R$$

Question 5

During fetal circulation, which structure allows blood to bypass the fetal lungs by connecting the pulmonary trunk to the aorta?

Accepted Answer

Ductus arteriosus

Question 6

Which of the following statements about the sympathetic nervous system (SNS) and blood vessels is correct?

Accepted Answer

SNS decreases the diameter of hard vessels, increasing resistance.

Question 7

Which vessel carries oxygen-rich blood from the placenta to the fetus during fetal circulation?

Accepted Answer

Umbilical vein

Question 8

A blockage in which vessel would most directly reduce nutrient and oxygen delivery to fetal tissues?

Accepted Answer

Umbilical vein

Question 9

Which of the following best describes the function of the foramen ovale in fetal circulation?

Accepted Answer

It connects the right atrium to the left atrium, bypassing the fetal lungs.

Question 10

If the resistance in a blood vessel doubles, what happens to the blood flow, assuming the pressure difference remains constant?

Accepted Answer

Blood flow is cut in half.

Question 11

Which of the following is a correct pathway for blood returning from the body to the fetal heart?

Accepted Answer

Umbilical vein → ductus venosus → inferior vena cava → right atrium

Question 12

Which of the following best explains why capillaries are the primary site of exchange between blood and tissues?

Accepted Answer

They have thin walls and a large surface area.

Question 13

Which vessel type contains the highest proportion of smooth muscle in its wall?

Accepted Answer

Arteries

Question 14

Which of the following is a direct effect of increased sympathetic nervous system activity on blood vessels?

Accepted Answer

Increased resistance due to vasoconstriction

Question 15

A newborn is found to have a patent ductus arteriosus. What is the most likely consequence?

Accepted Answer

Mixing of oxygenated and deoxygenated blood between the aorta and pulmonary artery

How many veins are in a 5.0 L at 2.0 atm and 300 K?

Study Guide - Practice Questions