Question

describe and list the five steps of digestion
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Answer 1

Answer:

Ingestion,digestion,absorption,assimilation and egestion are the five steps of digestion in a human body.

Answer 2

Ans.
DIGESTION IN MOUTH
Food is taken in or ingested through the mouth. Digestion begins inside your
mouth when you chew the food. The water in your mouth is a digestive juice
called saliva. It is secreted by the salivary glands in your mouth. Chewing
breaks down the food into small pieces and mixes it with saliva. This process
is called as mastication.
-A child has only 20 teeth-10 in each jaw. These are known as milk teeth.
They fall off by the age of 10 and are replaced by larger permanent teeth.
This set contains 32 teeth, 16 in each jaw. There are 4 incisors. 2 canines,
premolars and 6 molars in each jaw.
-Your front teeth are known as incisors. They are used for cutting.
-Next to the incisors are canines. They are used for piercing and tearing
pieces of food such as meat.
- The teeth at the back are broad and are used for grinding and crushing the
food. These are called molars and premolars.
-The white substance that covers our teeth is called enamel. It is the hardest
substance in the body.
-Our tongue is a muscular organ that helps us to eat food. Your tongue does
another job too. Small taste buds are spread across its surface. Each taste
buds detect different tastes-sweet, salty, sour, and bitter
DIGESTION IN THE STOMACH
-After the food is chewed, it passes through the esophagus. The oesophagus
leaves from our mouth to the stomach. It is made up of muscles. This
muscles gently pushdown food to our stomach in wave like action called
peristalsis.
-Food stays in stomach for few minutes to a few hours depending on the type
of food eaten. The inner lining of the stomach secretes mucus, hydrochloric
acid and digestive juices. The mucus protects the inner lining of the stomach.
The acid kills the bacteria that enters along with the food and helps in
digestion of proteins. The digestive juices break down proteins into simpler
substances.
-As food leaves your stomach, little by little it enters a long winding tube
below called small intestine
DIGESTION IN SMALL INTESTINE
-The muscles in the small intestine mixes food with more digestive juices.
The liver secretes bile juice which is stored in the gallbladder. The bile juice
breaks up fats into tiny droplets that can be digested and absorbed more
easily. The digestive juices then act on the tiny droplets to form simpler
compounds known as fatty acids and glycerol.
-The pancreas secretes the pancreatic juice that changes starch into simple
sugars, and proteins imo simper compounus cancer antino acids.

ABSORPTION IN SMALL INTESTINE
-Absorption of food occurs through thousands of small -like projections in
the inner walls of the small intestine. These projections are known as villi.
The food absorbed on the surface of the villus passes into blood in the
capillaries.
ASSIMILATION
-The food absorbed into the blood is transported to different parts of the
body. It is used to provide energy and materials for growth and repair of
body tissues. This is the final stage in the process of digestion and is called
assimilation
EGESTION
-The food that cannot be digested moves from the small intestine into a wide
tube called the large intestine. Here, most of the water present in the waste is
absorbed. The waste food which is now almost solid is stored in the last part
of large intestine called the rectum. It is then passed out of the body through
anus.