Digestion process for class 10th

The semi-digested food from stomuch chyme enters into small intestines, where complete digestion of chyme takes place by the action of more enzymes and juices.Small intestines are divided into three parts
1. Duodenum -- forms the first section of Small intestine. Pancreas and liver are connected to this region.These two organs release their juices i.e digestive enzymes and bile respectively. Trypsinogen and chymotrysinogen are the digestive enzymes released into the duodenum.

2.The jejunum-- is the middle section of small intestines.It is responsible for the absorption of

nutrients from the digested food.

3.Ileum ---is the last section of small intestines and is connected to the large intestines. This section absorbs the nutrients which were not absorbed by Jejunum.

The waste material enters into the large intestine where excessive water is absorbed.

Waste material gets collected in a bag like structure called Rectum and than this waste material is thrown out from the body through Anus.

In the next post we will disscuss how nutients are absorbed in the small intestines...??

Question for you..... 1.The semi- digested food is called as .........??

2.Name the two enzymes released in Duodenum..??

For previous post click here

Comments

Structure and function of Neuron

Neurons (nerve cells) are the functional units of the nervous system. A typical neuron is divided into three parts i.e Cell body or Soma,Some contains all the cell organelles like Nucleus, Mitochondria etc. Dendrites and Axon. Schwann cells of Axon are covered by Myelin Sheath. Dendrites are branched like structures on Soma. Axon terminal is also branched like structure. The signals are received from neuron by dendrites and are send to next neuron bye chemo-electrical impulses through axon. The junction between the two cells is known as Synapses.In neuron signal travels in the form of chemicals but at synapses in changes in to electrical impulses.

Absorption of Nutrients in Small Intestines

The digested food is now in simple form and is ready to use by cells. The inner wall of small intestines is called as Mucosa, it has numerous finger like projections called as Villi (singular- villus), which in-turn has finger like projections called as micro-villi. The purpose of villus is to provide large surface area for nutrient absorption. Villi have large network of blood capillaries, where the nutrients are absorbed in blood by diffusion.Most of the nutrients are absorbed in jejunum. except Iron is absorbed in duodenum vitamin B12 and bile salts are absorbed in the terminal ileum. Through blood digested food reaches to each and every cell of the body.

Simple Biology

Search This Blog