Circulatory System and Heart - Numerical Applications
Q. How many chambers does the human heart have?
Solution
The human heart has 4 chambers: two atria and two ventricles.
Correct Answer: A — 4
Q. How much blood does the average adult human heart pump per minute at rest?
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A.
4-6 liters
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B.
1-2 liters
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C.
8-10 liters
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D.
10-12 liters
Solution
The average adult human heart pumps about 4 to 6 liters of blood per minute at rest.
Correct Answer: A — 4-6 liters
Q. If a person's heart rate is 75 beats per minute, what is their cardiac output if the stroke volume is 70 mL?
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A.
5.25 L/min
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B.
4.5 L/min
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C.
6.0 L/min
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D.
3.0 L/min
Solution
Cardiac output is calculated as heart rate multiplied by stroke volume: 75 beats/min * 70 mL/beat = 5250 mL/min or 5.25 L/min.
Correct Answer: A — 5.25 L/min
Q. What is the average blood pressure in a healthy adult?
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A.
120/80 mmHg
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B.
140/90 mmHg
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C.
100/60 mmHg
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D.
130/85 mmHg
Solution
The average blood pressure in a healthy adult is typically around 120/80 mmHg.
Correct Answer: A — 120/80 mmHg
Q. What is the average heart rate of a healthy adult at rest?
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A.
60-100 beats per minute
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B.
40-60 beats per minute
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C.
100-120 beats per minute
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D.
120-140 beats per minute
Solution
The average heart rate of a healthy adult at rest is typically between 60 and 100 beats per minute.
Correct Answer: A — 60-100 beats per minute
Q. What is the average lifespan of a red blood cell?
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A.
120 days
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B.
30 days
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C.
60 days
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D.
90 days
Solution
The average lifespan of a red blood cell is about 120 days before it is recycled by the body.
Correct Answer: A — 120 days
Q. What is the primary function of red blood cells?
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A.
Transport oxygen
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B.
Fight infections
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C.
Clot blood
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D.
Regulate temperature
Solution
The primary function of red blood cells is to transport oxygen from the lungs to the body's tissues.
Correct Answer: A — Transport oxygen
Q. What is the stroke volume of a healthy adult heart?
-
A.
70 mL
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B.
50 mL
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C.
100 mL
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D.
30 mL
Solution
The stroke volume of a healthy adult heart is approximately 70 mL per beat.
Correct Answer: A — 70 mL
Q. What percentage of blood volume is typically plasma in a healthy adult?
-
A.
55%
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B.
45%
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C.
65%
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D.
75%
Solution
In a healthy adult, plasma typically makes up about 55% of total blood volume.
Correct Answer: A — 55%
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