Question

You have just eaten a peanut butter and jelly sandwich:

A. Where is the mechanical digestion of the proteins occurring?  Where is the chemical digestion of the proteins occurring?

B. Where is the mechanical digestion of the fats occurring?  Where is the chemical digestion of the fats occurring?

C. Where is the mechanical digestion of the starch occurring? Where is the chemical digestion of the starch occurring?

D. What are products of the chemical digestion of the proteins:_____________and where are these absorbed?  

E. What are the products of the chemical digestion of the starches: ____________ and where are they absorbed?  

F. What are the products of the chemical digestion of the fats:____________ and where are these absorbed?

G. Once absorbed into the blood stream, where do these nutrients go next????

Answer 1

Mechanical digestion involves physical breaking down of food into smaller particles like chewing, churning and segmentation.

Chemical digestion involves breakdown of food into absorbable particles by the action of chemicals like enzymes.

(A) mechanical digestion of protein occurs in mouth and stomach.

Chemical digestion of protein occurs in stomach and small intestine.

(B) mechanical digestion of fat occurs in mouth, stomach and duodenum of small intestine (by the action of bile)

Chemical digestion of fat occurs in small intestine.

(C) mechanical digestion of starch occurs in mouth and stomach.

Chemical digestion of starch occurs in mouth and small intestine.

(D) product of chemical digestion of proteins - amino acids (end product).

Products of protein digestion (amino acids) get absorbed into the wall of small intestine ( enterocytes).

(E) product of chemical digestion of starch - glucose (end product)

Product of starch digestion (glucose) is absorbed into the walls of the small intestine (enterocytes).

(F) product of fat digestion - fatty acids and glycerol

Product of fat digestion is absorbed into the walls of small intestine (enterocytes) then into lacteals.

(G) when these nutrients come into the blood circulation, via blood it circulates throughout the body . Blood supplies these nutrients to different cells of our body for their metabolism.