Question

Complete digestion food takes place in small intestine. Justify the statement

Answer 1

The small intestines are well adapted for absorbing nutrients during digestion by: being very long, having villi and microvilli that increase surface area, using muscular contractions to move and mix food, and receiving and housing digestive enzymes and bile that help the breakdown of food.

Long length
The average length of the small intestines in an adult is around 23 feet. It takes food around 8 hours to pass from beginning to end of the small intestines, which ensures there is enough time for digestion to occur.

Villi and microvilli
The small intestines are packed with villi and microvilli that increase surface area of the small intestines, which helps with absorption.

Muscular contractions
The small intestines are lined with smooth muscule tissue allowing for a process called Peristalsis which is the wavelike muscular contraction that propels food through the small intestines.

Digestive Enzymes
Enzymes secreted by the pancreas and bile from the gallbladder enter the small intestines and break down nutrients, the three main types of which are proteins, lipids, and carbohydrates.

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Answer 2

in salivary gland salivary amylase help in digestion of starch to maltose rest digestion take place in small intestine. it receives secretion from pancreas ,liver and digestive gland. Hepatopancreatic duct pour bile & pancreatic juice
Role of bile juice- it nutralises acidity and make medium alkaline
2. it emulsifies fat
Role of pancreatic juice - it makes medium alkaline
protein + proteoses+ peptones-------> peptides + amino acid
Fat -----> fatty acid + glycerol
starch + dextrin --->maltose