Question

which of the following statements regarding the heart is false?
narrow splitting of the s1 heart sound during inspiration is a normal finding.
the s2 heart sound is generated by closure of the semilunar valves.
splitting of the s2 heart sound during the expiration phase of respiration is a normal finding.
contraction of the atria occurs during diastole.

Explanation:

1. S1 heart - sound splitting during inspiration is usually not a normal finding. S1 is due to mitral and tricuspid valve closure and is usually a single sound.
2. S2 is generated by the closure of the semilunar (aortic and pulmonary) valves.
3. S2 splitting during expiration can be a normal finding in some individuals, especially in children and young adults.
4. Atrial contraction occurs during late - diastole.

Answer:

Narrow splitting of the S1 heart sound during inspiration is a normal finding.