1.what are vili? What is their location and function?
2.name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
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- The finger-like outgrowth on the inner walls of the small intestine are called villi. the villi increase the surface area for absorption of the digested food.
- cellulose is digested by ruminants but not by humans. This is because ruminants have cellulose-digesting bacteria.such bacteria are not present in human body.
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1. What are vili? What is their location and function?
- → Villi are small finger-like projections found inside the inner walls of the small intestine. They v increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials.
- → The structure of the small intestine is designed for absorption of nutrients. The inside of the small intestine is lined with villi that absorb nutrients from the liquid mixture called chyme produced in the stomach from the food we eat.
2. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
- → Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans. Ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria that are not present in humans.
- → Cellulose is a polysaccharide that makes 30% of the plant cell wall. It helps in connecting cells to form tissues and signals the cells to grow and divide. Humans cannot digest cellulose. However, it is consumed in the diet as fibre. Fibre helps the digestive system keep the food moving through the gut and moves the waste out of the body.
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