Question 1

Which of the following best describes the primary function of the circulatory system in maintaining homeostasis?

Accepted Answer

It transports nutrients, gases, and wastes to and from all cells.

Question 2

A patient presents with a hematocrit of 30%. Which of the following is the most likely physiological consequence?

Accepted Answer

Decreased oxygen-carrying capacity, possibly leading to anemia.

Question 3

Which plasma protein is primarily responsible for maintaining proper water balance between blood and interstitial fluid?

Accepted Answer

Albumins

Question 4

A person at high altitude experiences an increase in erythropoietin secretion. What is the physiological reason for this response?

Accepted Answer

Low oxygen levels at high altitude trigger the kidneys to release erythropoietin.

Question 5

Which of the following best explains why mature red blood cells (erythrocytes) do not consume the oxygen they transport?

Accepted Answer

They lack mitochondria and generate ATP anaerobically.

Question 6

Which of the following is a direct result of the breakdown of the heme group from hemoglobin in the liver?

Accepted Answer

Release of bilirubin, which is excreted in bile.

Question 7

A patient with liver failure develops jaundice. Which of the following best explains the underlying mechanism?

Accepted Answer

Inability to secrete bilirubin into bile, leading to accumulation in tissues.

Question 8

Which of the following best describes the role of thrombopoietin?

Accepted Answer

It regulates the formation of platelets from megakaryocytes.

Question 9

Which of the following is the correct sequence of events in hemostasis following a blood vessel injury?

Accepted Answer

Vascular spasm → Platelet plug formation → Blood clotting

Question 10

Which of the following statements about hemoglobin is TRUE?

Accepted Answer

Oxygen binds to the iron atom in the heme group.

Question 11

A patient is found to have a high hematocrit. Which of the following is a potential risk associated with this condition?

Accepted Answer

Increased blood viscosity and risk of heart attack or stroke

Question 12

Which of the following best describes the fate of iron after red blood cells are broken down?

Accepted Answer

It is returned to red bone marrow for reuse in new hemoglobin.

Question 13

Which of the following is a function of gamma globulins in plasma?

Accepted Answer

Fighting infection and disease

Question 14

Which of the following best explains why blood doping can be dangerous for athletes?

Accepted Answer

It increases blood viscosity, raising the risk of clots and cardiovascular events.

Question 15

Which of the following is NOT a component of plasma?

Accepted Answer

Red blood cells

Question 16

A patient with a genetic defect in fibrinogen production would most likely experience which of the following?

Accepted Answer

Impaired ability to form stable blood clots

Question 17

Which of the following best describes the process by which old and damaged red blood cells are removed from circulation?

Accepted Answer

Phagocytosis by macrophages in the liver and spleen

Question 18

Which of the following is a correct statement about the regulation of red blood cell production?

Accepted Answer

It is regulated by the oxygen-carrying capacity sensed by the kidneys.

Question 19

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

Accepted Answer

They form a plug by adhering to each other and the damaged vessel.

Question 20

Which of the following best explains why oxygen is released from hemoglobin in body tissues?

Accepted Answer

Body tissues have a lower oxygen concentration, lower pH, and increased temperature.

Blood: Structure, Function, and Homeostasis in Human Biology

Study Guide - Practice Questions