The diagram below represents a human digestive system.

      

The diagram below represents a human digestive system.
Q11172019854.png
(a) Name the muscles found in the part labeled A.
(b) Name and explain the role of the juice contained in the sac labeled B.
(c) Explain two adaptations of the part labeled D to its function.

  

Answers


Maurice
(a) cardiac sphincter

(b) bile
- emulsifies fats
-neutralizes the acidic chyme
- provides alkaline medium for enzymatic action

(c) highly coiled to reduce speed of food movement for maximum digestion/absorption
- has numerous villi and micro-villi for maximum absorption of food
- highly vascularized to create a steep diffusion gradient for transportation of food
- it is long to create a large surface area for digestion/absorption of food
- has goblet cells that secrete mucus; that prevents digestion of the walls by digestive enzymes
- has thin epithelium for faster diffusion of digested food products;
maurice.mutuku answered the question on November 7, 2019 at 05:57


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