The second car sound is produced by:
Correct answer: C. Closure of Semilunar valves
- A. Closure of AV valves
- B. Opening of AV valves
- C. Closure of Semilunar valves
- D. Opening of semilunar valves
Explanation
During ventricle contraction two heart sounds produce, 1st sound is "Lubb" produced when AV-valves close while the 2nd heart sound is "Dubb" which is produced when semilunar valves close.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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