Question 1

Which of the following best explains why multicellular animals require a cardiovascular system?

Accepted Answer

They need a system to transport nutrients, oxygen, carbon dioxide, and metabolic wastes between cells and the external environment.

Question 2

Which plasma protein is most responsible for maintaining the colloid osmotic pressure of blood?

Accepted Answer

Albumin

Question 3

A patient presents with yellowing of the skin and sclera. Laboratory tests reveal elevated bilirubin levels. Which of the following is the most likely cause?

Accepted Answer

Impaired liver function or rapid breakdown of erythrocytes

Question 4

Which of the following best describes the function of neutrophils?

Accepted Answer

Engulf and destroy bacteria and debris through phagocytosis

Question 5

During erythropoiesis, which cell type is released from the bone marrow into the bloodstream before maturing into an erythrocyte?

Accepted Answer

Reticulocyte

Question 6

Which of the following equations correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 7

Which of the following statements best explains why veins are considered compliance vessels?

Accepted Answer

They have thinner walls and less smooth muscle, allowing them to stretch and accommodate varying blood volumes.

Question 8

A blood vessel is observed to have a thick tunica media and a relatively narrow lumen. Which type of vessel is this most likely to be, and what is its primary function?

Accepted Answer

Artery; to withstand and regulate high pressure from the heart

Question 9

Which of the following best describes the process of diapedesis?

Accepted Answer

The movement of leukocytes out of the bloodstream and into tissues

Question 10

Which of the following is a correct sequence of events in the intrinsic pathway of the coagulation cascade?

Accepted Answer

Factor XII activation → Factor XI activation → Factor IX activation → Factor X activation

Question 11

Which of the following capillary types is most likely to be found in the liver and allows the passage of large proteins and cells?

Accepted Answer

Sinusoidal (discontinuous) capillaries

Question 12

A patient with a blood pH of 7.2 is experiencing which of the following conditions?

Accepted Answer

Acidosis

Question 13

Which of the following mechanisms assists venous return to the heart, especially from the lower limbs?

Accepted Answer

Skeletal muscle contraction compresses veins and venous valves prevent backflow.

Question 14

Which of the following is the correct order of layers (tunics) in a typical blood vessel wall, from innermost to outermost?

Accepted Answer

Tunica intima, tunica media, tunica adventitia

Question 15

Which of the following best describes the role of platelets in hemostasis?

Accepted Answer

They adhere to exposed collagen, aggregate, and release chemicals that promote further aggregation and clot formation.

Question 16

Which of the following statements about hemoglobin is correct?

Accepted Answer

Each hemoglobin molecule can bind up to four oxygen molecules because it contains four heme groups.

Question 17

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

Accepted Answer

They have thin walls composed of a single layer of endothelial cells, allowing efficient diffusion.

Question 18

Which of the following is the main function of the fibrin meshwork in a blood clot?

Accepted Answer

To trap blood cells and platelets, stabilizing the clot at the site of injury

Question 19

Which of the following best describes the function of the respiratory pump in venous return?

Accepted Answer

It creates a pressure gradient by lowering thoracic pressure during inhalation, drawing blood toward the heart.

The Cardiovascular System I: Blood & Vessels – Structure, Function, and Hemostasis

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