Circulatory System and Heart - Real World Applications
Q. How does exercise affect the circulatory system?
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A.
It decreases heart rate
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B.
It increases blood flow and heart rate
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C.
It reduces blood volume
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D.
It has no effect
Solution
Exercise increases blood flow and heart rate to meet the higher oxygen demands of the body during physical activity.
Correct Answer: B — It increases blood flow and heart rate
Q. What is the main purpose of the pulmonary circulation?
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A.
To supply blood to the body
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B.
To exchange gases in the lungs
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C.
To transport nutrients
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D.
To regulate blood pressure
Solution
The main purpose of pulmonary circulation is to exchange gases in the lungs, allowing carbon dioxide to be expelled and oxygen to be absorbed.
Correct Answer: B — To exchange gases in the lungs
Q. What is the primary function of the circulatory system in humans?
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A.
To digest food
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B.
To transport oxygen and nutrients
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C.
To regulate body temperature
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D.
To produce hormones
Solution
The primary function of the circulatory system is to transport oxygen and nutrients to cells and remove waste products.
Correct Answer: B — To transport oxygen and nutrients
Q. What is the role of the coronary arteries?
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A.
To supply blood to the lungs
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B.
To supply blood to the heart muscle
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C.
To drain blood from the heart
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D.
To connect the heart to the brain
Solution
Coronary arteries supply blood to the heart muscle itself, ensuring it receives the oxygen and nutrients needed to function.
Correct Answer: B — To supply blood to the heart muscle
Q. What is the significance of the sinoatrial (SA) node in the heart?
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A.
It pumps blood to the lungs
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B.
It generates electrical impulses for heartbeats
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C.
It regulates blood pressure
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D.
It stores blood
Solution
The sinoatrial (SA) node is known as the heart's natural pacemaker, generating electrical impulses that initiate heartbeats.
Correct Answer: B — It generates electrical impulses for heartbeats
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