What are the end-products of the digestion of:
starch, proteins and fats respectively?
3. Why is there no enzyme to digest vitamins ?
4. How is thorough chewing of food helpful in
digestion ?
5. What is the function of rectum ?
6. What is roughage? Give two examples.
absorbed
7. Mention two ways in which the ileum of a mammal
is adapted for the absorption of digested food.
8. The stomach secretes gastric juice, which contains
hydrochloric acid. What is its function ?
of teeth
D. LONG ANSWER TYPE
Answers
Answer:
1 the end product of starch are maltose ,
maltotriose, and a -dextrins, although some glucose is also produced.
.
fat will be digested into fatty acid or glycerol
.
protein will be digested into amino acid
3.
Vitamins are used in their original form by the cells. They do not require enzyme for digestion because they are absorbed directly from the digestive tract and transported by the blood to the cells.
4. chewing helps to break down the food and mix it with saliva an enzyme to help breakdown carbohydrates. Skipping this step means that your stomach has to work even harder to do this job.
5 the rectum act as a temporary storage site for feces. As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate.
6. roughage is basically edible fibre . It has the capacity to resist the enzymes of human digestive system. It helps in proper elimination of waste products. examples are whole grains like oats and vegetables like carrot
7.The inner layer of the ileum is lined up with the help of several finger like projections that is called villi. The villi can increase the surface area of the overall lining that can help in the increase of the rate of absorption.
8.The gastric chief cells of the stomach secrete enzymes for protein breakdown (inactive pepsinogen, and in infancy rennin). Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis.Acid in our stomach plays an essential role in the immune system by killing harmful bacteria and parasites that are ingested with food. Stomach acid activates the enzyme pepsin needed for protein digestion. Stomach acid signals to the pancreas produce digestive juices and enzymes to further break down food.