Question 1

Which of the following best explains why arteries have a thicker tunica media compared to veins?

Accepted Answer

Arteries must withstand higher pressure fluctuations from the heart's contractions.

Question 2

A patient presents with swelling in the lower limbs due to inefficient venous return. Which anatomical feature of veins is most likely compromised?

Accepted Answer

Valves within the veins

Question 3

Which equation correctly represents the relationship between blood pressure, cardiac output, and peripheral resistance?

Accepted Answer

$$BP = CO 	imes PR$$

Question 4

During vigorous exercise, which mechanism assists venous return to the heart?

Accepted Answer

Skeletal muscle contraction 'milks' blood toward the heart.

Question 5

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

Accepted Answer

Capillaries

Question 6

A patient has a blood pressure reading of 150/95 mm Hg. Which term best describes this condition?

Accepted Answer

Hypertension

Question 7

Which of the following would most likely cause an increase in peripheral resistance and thus raise blood pressure?

Accepted Answer

Vasoconstriction of arterioles

Question 8

Which of the following best describes the function of precapillary sphincters?

Accepted Answer

They regulate blood flow into capillary beds.

Question 9

If the osmotic pressure in the capillaries decreases significantly, what is the most likely consequence?

Accepted Answer

More fluid will remain in the interstitial space, leading to edema.

Question 10

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

Accepted Answer

Umbilical vein

Question 11

A blockage in the hepatic portal vein would most directly affect which process?

Accepted Answer

Transport of nutrient-rich blood from the digestive organs to the liver

Question 12

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

Accepted Answer

Vasoconstriction, increasing peripheral resistance

Question 13

Which of the following best describes the Circle of Willis?

Accepted Answer

A circular network of arteries that supplies blood to the brain

Question 14

Which of the following would most likely occur if the foramen ovale fails to close after birth?

Accepted Answer

Mixing of oxygenated and deoxygenated blood between the atria

Question 15

Which of the following is a correct pathway for blood returning from the lower limb to the right atrium?

Accepted Answer

Femoral vein → external iliac vein → common iliac vein → inferior vena cava

Question 16

Which of the following best explains why blood pressure is lowest in the veins?

Accepted Answer

Blood pressure decreases as distance from the heart increases due to friction and branching.

Question 17

A patient with severe liver disease develops edema. Which mechanism best explains this finding?

Accepted Answer

Decreased plasma protein production reduces capillary osmotic pressure.

Question 18

Which of the following is a function of the tunica intima in blood vessels?

Accepted Answer

Provides a friction-reducing lining for smooth blood flow

Question 19

Which of the following would most likely result from a diet high in salt, saturated fats, and cholesterol?

Accepted Answer

Increased risk of hypertension and arteriosclerosis

Question 20

Which of the following best describes the effect of angiotensin II on blood pressure?

Accepted Answer

It causes vasoconstriction and stimulates aldosterone release, increasing blood pressure.

Blood Vessels and Circulation: Structure, Function, and Physiology

Study Guide - Practice Questions