MCQ 81:
What is the function of the renal arteries?
A) Supply blood to the liver
B) Supply blood to the kidneys
C) Carry deoxygenated blood to the heart
D) Regulate blood pressure
Answer: B) Supply blood to the kidneys
Explanation: The renal arteries supply oxygenated blood to the kidneys, where it is filtered to remove waste products.
MCQ 82:
Which term describes the narrowing of blood vessels?
A) Vasodilation
B) Vasoconstriction
C) Vasospasm
D) Aneurysm
Answer: B) Vasoconstriction
Explanation: Vasoconstriction is the narrowing of blood vessels, which can increase blood pressure and reduce blood flow to certain areas.
MCQ 83:
What is the primary function of platelets?
A) Oxygen transport
B) Blood clotting
C) Immune defense
D) Nutrient transport
Answer: B) Blood clotting
Explanation: Platelets are essential for blood clotting, helping to stop bleeding by clumping together at the site of injury.
MCQ 84:
What is the main purpose of the pulmonary circuit?
A) Deliver oxygen to the body’s tissues
B) Remove carbon dioxide from the body
C) Circulate blood within the heart
D) Filter blood in the kidneys
Answer: B) Remove carbon dioxide from the body
Explanation: The pulmonary circuit carries deoxygenated blood from the right side of the heart to the lungs, where carbon dioxide is exchanged for oxygen.
MCQ 85:
What is the effect of high levels of carbon dioxide in the blood?
A) Decrease heart rate
B) Increase heart rate
C) Stabilize blood pressure
D) Decrease respiratory rate
Answer: B) Increase heart rate
Explanation: High levels of carbon dioxide in the blood signal the body to increase heart rate and respiratory rate to enhance the removal of carbon dioxide and improve oxygen intake.
MCQ 86:
What is the function of the right ventricle?
A) Pump oxygenated blood to the body
B) Pump deoxygenated blood to the lungs
C) Receive deoxygenated blood from the body
D) Pump blood to the aorta
Answer: B) Pump deoxygenated blood to the lungs
Explanation: The right ventricle pumps deoxygenated blood to the lungs through the pulmonary artery for oxygenation.
MCQ 87:
What is the role of the hypothalamus in relation to the cardiovascular system?
A) Pump blood
B) Regulate heart rate and blood pressure
C) Filter blood
D) Produce hormones
Answer: B) Regulate heart rate and blood pressure
Explanation: The hypothalamus helps regulate heart rate and blood pressure as part of the body’s response to stress and other stimuli.
MCQ 88:
Which type of blood cell is responsible for forming clots?
A) Erythrocytes
B) Leukocytes
C) Thrombocytes
D) Plasma
Answer: C) Thrombocytes
Explanation: Thrombocytes, or platelets, are crucial for blood clotting, helping to prevent excessive bleeding after an injury.
MCQ 89:
Which of the following structures is involved in the electrical conduction system of the heart?
A) Atrioventricular node
B) Coronary arteries
C) Aorta
D) Pulmonary veins
Answer: A) Atrioventricular node
Explanation: The atrioventricular (AV) node is a key component of the heart’s electrical conduction system, facilitating the transmission of electrical impulses from the atria to the ventricles.
MCQ 90:
What is the role of the jugular veins?
A) Carry deoxygenated blood from the brain
B) Supply blood to the brain
C) Filter blood
D) Pump blood to the heart
Answer: A) Carry deoxygenated blood from the brain
Explanation: The jugular veins are responsible for returning deoxygenated blood from the brain to the heart.
Leave a comment