DIGESTIVE SYSTEMDIGESTIVE SYSTEM

BYBY•BHAVYA.V.SBHAVYA.V.S•CHANDRAKALA.RCHANDRAKALA.R•JAYASHREE.MJAYASHREE.M•BHAVANA.RBHAVANA.R•RASHMI.R RASHMI.R •DEVI.ADEVI.A

MAIN FUNCTION OF MAIN FUNCTION OF DIGESTIVE SYSTEM IS DIGESTIVE SYSTEM IS

DIGESTION.DIGESTION.Digestion is conversion ofDigestion is conversion of

complex larger food complex larger food molecules into simpler molecules into simpler smaller molecules by smaller molecules by the action of enzymes the action of enzymes for easy absorptionfor easy absorption

Two types of digestionTwo types of digestion

a) Mechanical digestion :- It is breaking up of a) Mechanical digestion :- It is breaking up of larger particles of food into fine paste with larger particles of food into fine paste with the help of teeth & tongue.the help of teeth & tongue.

b) Chemical digestion :- It is the hydrolysis of b) Chemical digestion :- It is the hydrolysis of food into simplest particles by the action of food into simplest particles by the action of enzymesenzymes..

It is a group of organs which helps in It is a group of organs which helps in supply of nutrients by the food we supply of nutrients by the food we consume with the help ofconsume with the help of its its parts.

Parts of digestive Parts of digestive systemsystem

a)a)MouthMouthb)b)PharynxPharynxc)c)EpiglottisEpiglottisd)d)TracheaTracheae)e)OesophagusOesophagusf)f) StomachStomachg)g)LiverLiver

h) Pancreash) Pancreasi)i) SmallSmall IntestineIntestineJ)J) DuodenumDuodenumk)k)Large IntestineLarge IntestineL ) Rectum &L ) Rectum &m) Anusm) Anus

DIGESTIVE SYSTEMDIGESTIVE SYSTEM

MOUTH & PHARYNXMOUTH & PHARYNX

Mouth is the first part of digestive Mouth is the first part of digestive system. It leads into Buccal cavity system. It leads into Buccal cavity which leads into teeth & tongue. which leads into teeth & tongue. Mouth secretes salivary juice.Mouth secretes salivary juice.

Pharynx is the common passage for Pharynx is the common passage for both food which leads into both food which leads into Oesophagus.Oesophagus.

Epiglottis & esophagus.Epiglottis & esophagus.

Larynx is a part of respiratory Larynx is a part of respiratory system) temporarily closed by system) temporarily closed by cartilaginous flap called cartilaginous flap called epiglottis.epiglottis.

Esophagus is a muscular tube Esophagus is a muscular tube connecting pharynx with connecting pharynx with stomach. It helps to push the stomach. It helps to push the bolus downwards into stomach.bolus downwards into stomach.

StomachStomach

It is a big shaped muscular organ. It is a big shaped muscular organ. The layers of muscles in the wall of The layers of muscles in the wall of muscle contract & relax bringing muscle contract & relax bringing about churning movement of food. about churning movement of food. Gastric juice is produced inside the Gastric juice is produced inside the stomach.stomach.

Liver & gall bladderLiver & gall bladder

Liver produces bile juice which is Liver produces bile juice which is basic in nature. This bile juice is basic in nature. This bile juice is basic in nature because the acidified basic in nature because the acidified food in our stomach. The bile juice food in our stomach. The bile juice produced in the liver is stored in produced in the liver is stored in the gall bladder.the gall bladder.

PancreasPancreas

It is a feather like structure where It is a feather like structure where pancreatic juice is produced. pancreatic juice is produced.

Pancreatic juice contains the Pancreatic juice contains the following enzymes:-following enzymes:-

1)Amylase1)Amylase

2)Pancreatic lipase.2)Pancreatic lipase.

Small intestine & Duodenum.Small intestine & Duodenum.

The absorption of digestion of The absorption of digestion of food takes place in small intestine food takes place in small intestine through villi finger like structure.through villi finger like structure.

After the absorption, the food is After the absorption, the food is turned into a semi liquid known as turned into a semi liquid known as chyme which will be pushed into chyme which will be pushed into the first part of small intestine the first part of small intestine namely duodenum.namely duodenum.

Large intestine.Large intestine.

After the absorption of food, the After the absorption of food, the undigested food is then passed into undigested food is then passed into large intestine. Large intestine or large intestine. Large intestine or colon begins as pouch called colon begins as pouch called caecum. The wall of large intestine caecum. The wall of large intestine absorbs water & salt from the absorbs water & salt from the undigested food.undigested food.

Rectum & Anus.Rectum & Anus.

Rectum is a part where waste Rectum is a part where waste substances of our body is stored.substances of our body is stored.

Anus is the last part where waste Anus is the last part where waste substances are removed out of our substances are removed out of our body. body.

We thank our science teacher We thank our science teacher & computer teachers for & computer teachers for helping us to do this project.helping us to do this project.