22. Absorption of food nutrients happens almost entirely in which organ? a) the

Question

22. Absorption of food nutrients happens almost entirely in which organ? a) the large intestine d) the esophagus b) the small intestine c) the stomach e) the liver 23. How do sea stars eat? a. they use their water vascular system to filter food particles out of the water. b. they cover a bivalve, and spit up exoenzymes. Then they use their tube feet to bring the food particles to their mouth c. they remove their stomach from their body, digest the food in the shell of a bivalve, then slurp up the stomach and the digested food. d. filter feed

Explanation / Answer

22. The correct answer is b) The Small Intestine.

Explanation: The small intestine also known as small bowel is the part of gastrointestinal tract and lies between the stomach and large intestine. It is accountable for 90-95% of food nutrient absorption. It has 3 parts-

*  Stomach is responsible for the churning and mechanical breakdown of food.

* Esophagus is responsible for carrying food, liquids, and saliva from the mouth to the stomach.

* Large Intestine  is responsible for the absorbption of water from the remaining indigestible food matter and transfer the useless waste material from the body.

* Liver is responsible for bile production and excretion.

23. The correct answer is c) they remove their stomach from their body, digest the food in the shell of a bivalve, then slurp up the stomach and the digested food.

Initially, the sea stars hold their prey (ex- oyesters and clams) with their suction feet and open them apart to eat the muscle inside the shells. Then, once the prey's shell is open, the stomach of the sea star emerges from the middle of the underside of its star-shaped body to absorb the prey inside itself.

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