Question 1

Which of the following best describes the primary function of erythrocytes (red blood cells) in the human body?

Accepted Answer

Carrying oxygen from the lungs to tissues and removing carbon dioxide

Question 2

Which statement correctly explains the difference between antigens and antibodies in blood typing?

Accepted Answer

Antigens are markers on the surface of red blood cells, while antibodies are proteins in plasma that recognize foreign antigens.

Question 3

A patient with type AB blood receives a transfusion of type O blood. What is the most likely outcome?

Accepted Answer

The transfusion will be successful because type O blood lacks A and B antigens.

Question 4

Which of the following equations correctly represents cardiac output ($$CO) in $$terms of stroke volume ($$SV) $$and heart rate ($$HR$$)?

Accepted Answer

$$CO = SV 	imes HR$$

Question 5

During the cardiac cycle, which phase is characterized by ventricular contraction and ejection of blood into the arteries?

Accepted Answer

Systole

Question 6

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

Accepted Answer

Capillaries

Question 7

A patient’s blood pressure is measured as 120/80 mmHg. What does the 80 mmHg value represent?

Accepted Answer

The pressure in the arteries during ventricular relaxation (diastolic pressure)

Question 8

Which of the following best explains why veins have valves?

Accepted Answer

To prevent the backflow of blood and ensure one-way movement toward the heart

Question 9

Which of the following is a correct description of the pulmonary circuit?

Accepted Answer

It transports deoxygenated blood from the right ventricle to the lungs for oxygenation.

Question 10

Which formula correctly calculates mean arterial pressure ($$MAP) $$using systolic ($$SP) $$and diastolic ($$DP) $$pressures?

Accepted Answer

$$MAP = DP + \frac{1}{3}(SP - DP)$$

Question 11

Which of the following best describes the role of lymph nodes in the lymphatic system?

Accepted Answer

They filter lymph and trap pathogens, facilitating immune responses.

Question 12

A patient is diagnosed with edema due to lymphatic obstruction. Which mechanism best explains this condition?

Accepted Answer

Increased filtration of fluid from capillaries into tissues without adequate lymphatic drainage

Question 13

Which of the following is a correct sequence of blood flow through the heart starting with the right atrium?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta

Question 14

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of cardiac muscle fibers, the greater the force of contraction

Question 15

Which of the following is a function of the spleen in the lymphatic system?

Accepted Answer

Filtering blood and removing old or damaged red blood cells

Question 16

Which of the following best explains the effect of increased sympathetic stimulation on heart rate?

Accepted Answer

It increases heart rate by stimulating the SA node

Question 17

Which of the following is a correct description of the function of Peyer’s patches?

Accepted Answer

They monitor intestinal bacteria and prevent the growth of pathogenic microbes in the gut

Question 18

Which of the following best describes the role of albumin in blood plasma?

Accepted Answer

It maintains osmotic pressure and helps regulate fluid balance

Question 19

Which of the following is a correct description of the function of the lymphatic system?

Accepted Answer

It returns excess interstitial fluid to the bloodstream and provides immune defense

Question 20

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It pumps blood to the entire body, requiring greater force to overcome systemic resistance

Blood, Heart, Blood Vessels, and Lymphatic System: Structured Study Notes

Study Guide - Practice Questions