Question 1

Which layer of the blood vessel wall is primarily responsible for regulating vessel diameter through vasoconstriction and vasodilation?

Accepted Answer

Tunica media

Question 2

A patient presents with swelling in the lower limbs due to prolonged standing. Which of the following is the most likely cause?

Accepted Answer

Varicose veins due to dysfunctional venous valves

Question 3

Which of the following equations correctly calculates mean arterial pressure (MAP)?

Accepted Answer

$$MAP = (systolic - diastolic)/3 + diastolic$$

Question 4

Which type of capillary is most likely to be found in the liver, allowing passage of proteins and even cells?

Accepted Answer

Sinusoidal capillary

Question 5

A thrombus in the right femoral vein could most directly lead to which of the following complications?

Accepted Answer

Pulmonary embolism

Question 6

Which vessel type has the largest lumen and is most likely to collapse under extremely low pressure?

Accepted Answer

Vein

Question 7

Which of the following best describes the function of the hepatic portal vein?

Accepted Answer

It transports nutrient-rich blood from the digestive tract to the liver.

Question 8

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

Accepted Answer

Heart → artery → arteriole → capillary → postcapillary venule → vein → heart

Question 9

A patient with low albumin levels is likely to experience which of the following?

Accepted Answer

Decreased capillary osmotic pressure and increased edema

Question 10

Which lymphatic structure is responsible for draining lymph from the left lower limb?

Accepted Answer

Thoracic duct

Question 11

Which of the following is a function of the spleen?

Accepted Answer

Filtration of blood and removal of old red blood cells

Question 12

Which of the following best describes the role of baroreceptors in the carotid sinuses?

Accepted Answer

They monitor blood pressure and initiate reflexes to maintain homeostasis.

Question 13

A patient with a damaged thymus would most likely have a deficiency in which of the following?

Accepted Answer

T-cell maturation

Question 14

Which of the following hormones would increase blood pressure by promoting vasoconstriction?

Accepted Answer

Angiotensin II

Question 15

Which of the following is a primary lymphatic organ?

Accepted Answer

Thymus

Question 16

A patient with a blockage in the lymphatic capillaries of the lower limb is most likely to develop which condition?

Accepted Answer

Edema in the lower limb

Question 17

Which of the following best explains why veins have valves but arteries do not?

Accepted Answer

Veins operate under lower pressure and need valves to prevent backflow.

Question 18

Which of the following is the main driving force for fluid filtration out of capillaries into tissues?

Accepted Answer

Capillary hydrostatic pressure

Question 19

Which of the following best describes the function of lacteals in the lymphatic system?

Accepted Answer

They absorb dietary lipids from the small intestine.

Question 20

A patient with a history of breast cancer has enlarged axillary lymph nodes. What is the most likely explanation?

Accepted Answer

Cancer cells have metastasized to the lymph nodes via lymphatic vessels.

Blood Vessels and Lymphatic System: Structure, Function, and Clinical Correlations

Study Guide - Practice Questions