MCQ 71:
What is the role of the heart’s septum?
A) Pump blood
B) Separate the left and right sides of the heart
C) Generate electrical impulses
D) Allow blood to flow freely
Answer: B) Separate the left and right sides of the heart
Explanation: The septum is the wall that divides the heart into left and right sides, preventing mixing of oxygenated and deoxygenated blood.
MCQ 72:
Which part of the heart pumps oxygenated blood to the body?
A) Right atrium
B) Left atrium
C) Left ventricle
D) Right ventricle
Answer: C) Left ventricle
Explanation: The left ventricle pumps oxygenated blood into the aorta for distribution to the rest of the body.
MCQ 73:
Which factor is most important in determining blood type?
A) Plasma proteins
B) Antigens on red blood cells
C) White blood cell count
D) Platelet levels
Answer: B) Antigens on red blood cells
Explanation: Blood type is determined by the presence or absence of specific antigens on the surface of red blood cells.
MCQ 74:
What is the function of the pulmonary valve?
A) Prevent backflow into the right atrium
B) Prevent backflow into the right ventricle
C) Allow blood to flow from the right ventricle to the lungs
D) Regulate blood pressure
Answer: C) Allow blood to flow from the right ventricle to the lungs
Explanation: The pulmonary valve prevents backflow of blood from the pulmonary artery into the right ventricle after blood is pumped to the lungs.
MCQ 75:
Which of the following is a sign of anemia?
A) High blood pressure
B) Increased heart rate
C) Fatigue and weakness
D) Elevated white blood cell count
Answer: C) Fatigue and weakness
Explanation: Anemia often leads to fatigue and weakness due to insufficient oxygen delivery to tissues caused by low red blood cell levels.
MCQ 76:
What is the role of the myocardium?
A) Store blood
B) Contract and pump blood
C) Filter waste
D) Produce hormones
Answer: B) Contract and pump blood
Explanation: The myocardium is the muscular layer of the heart responsible for the contraction and pumping action that circulates blood.
MCQ 77:
Which component of blood helps in fighting infections?
A) Erythrocytes
B) Thrombocytes
C) Plasma
D) Leukocytes
Answer: D) Leukocytes
Explanation: Leukocytes, or white blood cells, are vital for the immune response, helping the body to fight infections and foreign invaders.
MCQ 78:
What is the primary function of the aortic arch?
A) Pump blood
B) Regulate blood pressure
C) Distribute blood to the upper body
D) Return deoxygenated blood to the heart
Answer: C) Distribute blood to the upper body
Explanation: The aortic arch branches off to supply blood to the head, neck, and arms, distributing oxygenated blood from the heart to the upper body.
MCQ 79:
What happens during the cardiac cycle?
A) The heart beats and pumps blood through the body.
B) The heart only relaxes without pumping.
C) Blood only flows in one direction.
D) The heart enlarges and shrinks.
Answer: A) The heart beats and pumps blood through the body.
Explanation: The cardiac cycle consists of all the events that occur during one heartbeat, including both contraction and relaxation phases.
MCQ 80:
Which heart chamber receives deoxygenated blood from the body?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Answer: B) Right atrium
Explanation: The right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae.
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