The heart beat cycle starts when electric impulses are generated from:
Correct answer: B. SA Node
- A. AV Node
- B. SA Node
- C. SV Node
- D. PQ Node
Explanation
The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium.
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About Digestion
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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