Q. What is the function 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 transport oxygenated blood to the body
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
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Q. What is the primary effect of the renin-angiotensin-aldosterone system (RAAS)?
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A.
Decrease heart rate
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B.
Increase blood volume and pressure
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C.
Decrease blood glucose levels
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D.
Increase oxygen delivery to tissues
Solution
The RAAS primarily increases blood volume and pressure through the retention of sodium and water.
Correct Answer:
B
— Increase blood volume and pressure
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Q. What is the primary mechanism by which the body maintains homeostasis of blood pressure?
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A.
Hormonal regulation
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B.
Nervous system regulation
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C.
Kidney function
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D.
All of the above
Solution
The body maintains homeostasis of blood pressure through hormonal regulation, nervous system regulation, and kidney function.
Correct Answer:
D
— All of the above
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Q. Which of the following factors can increase heart rate?
-
A.
Increased parasympathetic activity
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B.
Increased sympathetic activity
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C.
Decreased body temperature
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D.
Increased blood viscosity
Solution
Increased sympathetic activity stimulates the heart and raises heart rate, while parasympathetic activity decreases it.
Correct Answer:
B
— Increased sympathetic activity
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Q. Which part of the ECG corresponds to ventricular depolarization?
-
A.
P wave
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B.
QRS complex
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C.
T wave
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D.
U wave
Solution
The QRS complex on an ECG represents the depolarization of the ventricles, leading to their contraction.
Correct Answer:
B
— QRS complex
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