Q. What is the function of the sinoatrial (SA) node?
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A.
To contract the ventricles
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B.
To initiate the heartbeat
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C.
To regulate blood pressure
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D.
To filter blood
Solution
The sinoatrial (SA) node is known as the heart's natural pacemaker, initiating the heartbeat.
Correct Answer:
B
— To initiate the heartbeat
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Q. What is the main function of red blood cells in the cardiovascular system?
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A.
To fight infections
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B.
To transport oxygen
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C.
To regulate blood pressure
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D.
To clot blood
Solution
The main function of red blood cells is to transport oxygen from the lungs to the body's tissues.
Correct Answer:
B
— To transport oxygen
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Q. What is the primary function of the heart in the cardiovascular system?
-
A.
To filter blood
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B.
To pump blood throughout the body
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C.
To produce hormones
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D.
To store oxygen
Solution
The primary function of the heart is to pump blood throughout the body, supplying oxygen and nutrients to tissues.
Correct Answer:
B
— To pump blood throughout the body
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Q. What is the primary role of the pulmonary circulation?
-
A.
To supply the body with oxygen
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B.
To remove carbon dioxide from the body
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C.
To transport blood to the lungs for oxygenation
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D.
To distribute hormones
Solution
The primary role of the pulmonary circulation is to transport blood to the lungs for oxygenation.
Correct Answer:
C
— To transport blood to the lungs for oxygenation
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Q. Which part of the cardiovascular system is responsible for nutrient and gas exchange?
-
A.
Arteries
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B.
Veins
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C.
Capillaries
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D.
Heart
Solution
Capillaries are the smallest blood vessels where nutrient and gas exchange occurs between blood and tissues.
Correct Answer:
C
— Capillaries
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