APHY 101 Exam 2 Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which organ is primarily responsible for pumping blood
throughout the body?
A. Liver
B. Lung
C. Heart
D. Kidney
Rationale: The heart is the muscular organ responsible for circulating
blood through the pulmonary and systemic circuits. It delivers oxygen
and nutrients to tissues while removing carbon dioxide and metabolic
wastes.
2. Which chamber of the heart pumps oxygenated blood into the
systemic circulation?
A. Right atrium
B. Right ventricle
, C. Left atrium
D. Left ventricle
Rationale: The left ventricle has the thickest myocardium because it
generates the high pressure needed to propel oxygen-rich blood
throughout the entire body via the aorta.
3. Which blood vessel carries oxygenated blood from the lungs to
the heart?
A. Pulmonary artery
B. Superior vena cava
C. Inferior vena cava
D. Pulmonary veins
Rationale: Pulmonary veins are unique because they carry oxygen-rich
blood from the lungs to the left atrium, unlike most veins, which carry
deoxygenated blood.
4. Which valve prevents backflow of blood from the left ventricle
into the left atrium?
A. Tricuspid valve
B. Pulmonary valve
C. Aortic valve
D. Mitral (bicuspid) valve
,Rationale: The mitral valve opens during ventricular filling and closes
during ventricular contraction, preventing blood from flowing
backward into the left atrium.
5. Which layer of the heart wall is responsible for contraction?
A. Endocardium
B. Epicardium
C. Pericardium
D. Myocardium
Rationale: The myocardium consists of cardiac muscle tissue that
contracts rhythmically to pump blood throughout the cardiovascular
system.
6. Which blood vessel has the highest blood pressure?
A. Superior vena cava
B. Pulmonary vein
C. Femoral vein
D. Aorta
Rationale: The aorta receives blood directly from the left ventricle,
making it the vessel with the highest pressure in the circulatory
system.
7. Which blood cells transport oxygen?
A. Platelets
, B. Leukocytes
C. Plasma cells
D. Erythrocytes
Rationale: Erythrocytes (red blood cells) contain hemoglobin, which
binds oxygen in the lungs and transports it to body tissues.
8. Which component of blood is primarily responsible for clotting?
A. Plasma
B. Red blood cells
C. White blood cells
D. Platelets
Rationale: Platelets initiate blood clot formation by adhering to
damaged blood vessels and activating coagulation pathways.
9. Which white blood cell produces antibodies?
A. Neutrophil
B. Monocyte
C. Eosinophil
D. B lymphocyte
Rationale: B lymphocytes differentiate into plasma cells that secrete
antibodies specific to invading pathogens.
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which organ is primarily responsible for pumping blood
throughout the body?
A. Liver
B. Lung
C. Heart
D. Kidney
Rationale: The heart is the muscular organ responsible for circulating
blood through the pulmonary and systemic circuits. It delivers oxygen
and nutrients to tissues while removing carbon dioxide and metabolic
wastes.
2. Which chamber of the heart pumps oxygenated blood into the
systemic circulation?
A. Right atrium
B. Right ventricle
, C. Left atrium
D. Left ventricle
Rationale: The left ventricle has the thickest myocardium because it
generates the high pressure needed to propel oxygen-rich blood
throughout the entire body via the aorta.
3. Which blood vessel carries oxygenated blood from the lungs to
the heart?
A. Pulmonary artery
B. Superior vena cava
C. Inferior vena cava
D. Pulmonary veins
Rationale: Pulmonary veins are unique because they carry oxygen-rich
blood from the lungs to the left atrium, unlike most veins, which carry
deoxygenated blood.
4. Which valve prevents backflow of blood from the left ventricle
into the left atrium?
A. Tricuspid valve
B. Pulmonary valve
C. Aortic valve
D. Mitral (bicuspid) valve
,Rationale: The mitral valve opens during ventricular filling and closes
during ventricular contraction, preventing blood from flowing
backward into the left atrium.
5. Which layer of the heart wall is responsible for contraction?
A. Endocardium
B. Epicardium
C. Pericardium
D. Myocardium
Rationale: The myocardium consists of cardiac muscle tissue that
contracts rhythmically to pump blood throughout the cardiovascular
system.
6. Which blood vessel has the highest blood pressure?
A. Superior vena cava
B. Pulmonary vein
C. Femoral vein
D. Aorta
Rationale: The aorta receives blood directly from the left ventricle,
making it the vessel with the highest pressure in the circulatory
system.
7. Which blood cells transport oxygen?
A. Platelets
, B. Leukocytes
C. Plasma cells
D. Erythrocytes
Rationale: Erythrocytes (red blood cells) contain hemoglobin, which
binds oxygen in the lungs and transports it to body tissues.
8. Which component of blood is primarily responsible for clotting?
A. Plasma
B. Red blood cells
C. White blood cells
D. Platelets
Rationale: Platelets initiate blood clot formation by adhering to
damaged blood vessels and activating coagulation pathways.
9. Which white blood cell produces antibodies?
A. Neutrophil
B. Monocyte
C. Eosinophil
D. B lymphocyte
Rationale: B lymphocytes differentiate into plasma cells that secrete
antibodies specific to invading pathogens.
