MCQ 111:
Which of the following factors can increase the risk of atherosclerosis?
A) Regular exercise
B) High cholesterol levels
C) Low blood pressure
D) Healthy diet
Answer: B) High cholesterol levels
Explanation: High levels of cholesterol can lead to the buildup of plaques in the arteries, increasing the risk of atherosclerosis.
MCQ 112:
What is the main purpose of the coronary circulation?
A) Supply blood to the lungs
B) Supply blood to the heart muscle
C) Transport blood to the brain
D) Return deoxygenated blood to the heart
Answer: B) Supply blood to the heart muscle
Explanation: Coronary circulation refers to the flow of blood to and from the tissues of the heart muscle, ensuring it receives the oxygen and nutrients it needs.
MCQ 113:
Which blood type is known as the universal donor?
A) Type A
B) Type B
C) Type AB
D) Type O
Answer: D) Type O
Explanation: Type O blood can be donated to any blood type because it lacks A and B antigens, reducing the risk of transfusion reactions.
MCQ 114:
What is the primary cause of varicose veins?
A) Increased exercise
B) Poor venous circulation
C) High blood pressure
D) Healthy diet
Answer: B) Poor venous circulation
Explanation: Varicose veins occur when veins become enlarged and twisted due to weakened valves that lead to poor blood flow.
MCQ 115:
Which of the following is NOT a function of blood?
A) Transport of nutrients
B) Regulation of body temperature
C) Protection against pathogens
D) Absorption of oxygen in tissues
Answer: D) Absorption of oxygen in tissues
Explanation: Blood transports oxygen to tissues but does not absorb it; oxygen is absorbed in the lungs and carried by hemoglobin in red blood cells.
MCQ 116:
What is the function of the tricuspid valve?
A) Prevent backflow from the right ventricle to the right atrium
B) Prevent backflow from the aorta to the left ventricle
C) Allow blood flow from the left atrium to the left ventricle
D) Regulate blood flow to the lungs
Answer: A) Prevent backflow from the right ventricle to the right atrium
Explanation: The tricuspid valve ensures that blood flows from the right atrium into the right ventricle and prevents backflow during contraction.
MCQ 117:
Which vitamin is essential for the synthesis of clotting factors?
A) Vitamin A
B) Vitamin B12
C) Vitamin C
D) Vitamin K
Answer: D) Vitamin K
Explanation: Vitamin K is crucial for the synthesis of several clotting factors in the liver, which are necessary for normal blood coagulation.
MCQ 118:
What is the effect of a decrease in oxygen levels on heart rate?
A) Increase heart rate
B) Decrease heart rate
C) No effect on heart rate
D) Stabilize heart rate
Answer: A) Increase heart rate
Explanation: A decrease in oxygen levels stimulates the body to increase heart rate to enhance oxygen delivery to tissues.
MCQ 119:
Which of the following is a function of the circulatory system?
A) Digestion
B) Hormone production
C) Transport of nutrients and waste
D) Immune response
Answer: C) Transport of nutrients and waste
Explanation: The circulatory system transports nutrients to cells and removes waste products, playing a key role in maintaining homeostasis.
MCQ 120:
What type of blood vessel carries oxygenated blood away from the heart?
A) Vein
B) Artery
C) Capillary
D) Lymphatic vessel
Answer: B) Artery
Explanation: Arteries carry oxygenated blood away from the heart to the body, except for the pulmonary arteries, which carry deoxygenated blood to the lungs.
Leave a comment