Which of the following is accurate regarding the first heart sound or S1?
is considered an abnormal sound
is associated with closure of the atrioventricular valves
taking a deep breath will soften the sound of $1
is associated with closure of the semilunar valves
The Correct Answer is B
A. Is considered an abnormal sound:
S1 is a normal heart sound, marking the beginning of systole.
B. Is associated with closure of the atrioventricular valves:
S1 occurs with closure of the mitral and tricuspid valves at the start of systole.
C. Taking a deep breath will soften the sound of S1:
S1 may split with respiration, but it's not necessarily softer; this is more common with S2.
D. Is associated with closure of the semilunar valves:
Closure of semilunar valves (aortic and pulmonic) produces the second heart sound (S2).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Diaphragm and intercostals:
These are the major muscles responsible for normal, quiet inspiration by expanding the thoracic cavity.
B. Trapezius and rectus abdominis:
Accessory muscles used in forced respiration, not normal breathing.
C. Sternomastoid and scalene:
Also accessory muscles used during labored or deep breathing—not typical in quiet respiration.
D. External obliques and pectoralis major:
These may assist with forced exhalation but are not primary muscles for normal inspiration.
Correct Answer is B
Explanation
A. Is considered an abnormal sound:
S1 is a normal heart sound, marking the beginning of systole.
B. Is associated with closure of the atrioventricular valves:
S1 occurs with closure of the mitral and tricuspid valves at the start of systole.
C. Taking a deep breath will soften the sound of S1:
S1 may split with respiration, but it's not necessarily softer; this is more common with S2.
D. Is associated with closure of the semilunar valves:
Closure of semilunar valves (aortic and pulmonic) produces the second heart sound (S2).
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