Animals tissues and Organs

Functions of the digestive system
1. A system is a group of organs that performs a particular function.
2. The function of the digestive system is to break down the food you eat so the food molecules can enter the blood.
3. Salivary glands, which secrete a digestive juice called saliva- Saliva contains enzymes that break down starch in the food.
4. Panceas, which secretes pancretic juice- This contains more enzymes that break down starch, proteins and fats in the food.
5. small intestine, where the enzymes from the panceas work- After they have digested the food and broken down it down to small, soluble molecules, these seep through the walls of the intestine into the bood, along with most of the water in the food. This is called absorption.
6. Large intestine- Undigested food passes through on its way to the outside world as feaces (poo). As food moves through here, more water is absorbed from it.
7. Liver, which secretes bile to aid digestion of fats.
8. Stomach, where proteins are digested.
9. REMEMBER! A group of cells is called tissues. Organs are made up of different types of tissues. The heart contains muscle tissues that can contract and relax, nervous tissues t control the heart beat, and ligaments to hold the different tissues in place.
Protecting the digestive system
1. The whole of the digestive system is lined with epithelial tissue to protect the cells in the organs from digestive juices which could break them down.
2. This tissue secretes large quantities of mucus, which forms a barrier over the inner surface of the digestive organs. The mucus also make it easier for the food to slide through the digestive system.

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Animals tissues and Organs

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	Created by nancy.carter97 about 10 years ago