The most appropriate statement for atrial systole is:
Correct answer: C. A. V valves open and semilunar valves close
- A. A.V valves close
- B. A.V valves open
- C. A. V valves open and semilunar valves close
- D. A. V valves close and semilunar valves open
Explanation
During atrial systole, the atria-ventricular valves remain open while semi-lunar valves remain close because the pressure gradient between the atrium and ventricle is preserved during late ventricular diastole.
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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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