Revision for primary 4

[left] Keeping the Digestive System Healthy
1- Chew the food well.
2- Don't eat much food that contains large amounts of fats such as fast meals.
3- Do not eat food contain additive compounds and flavorings.
4- Skip purchasing food from streets to avoid infectious

Digestion:
Changing the food from a complex form into a simple one to let the body get Benefited
Absorption
Digested food is absorbed through the small intestine walls then it reaches blood which distributes it all over the body

]Completecolor]

1-Digestion starts in … mouth… and ends in …small intestine……
2-liver secretes .bile juice...in ……duodenum......
3- Digested food is absorbed through the small intestine wall…… -
salivary glands secretes…….saliva..... in the …mouth
5- Duodenum is followed by a part of small intestine known as...ileum
4- salivary glands secretes…….saliva..... in the …mouth
6 – Saliva converts …starch ….into .sugar…
7- digestive canal starts with ……mouth….....and ends with…..anus...
8- Number of teeth in adults is …32…..
9- Number of teeth in each jaw is …16…
10-Number of incisors in each jaw is …4…., while the number of molars is …10…..
11-Gastric juice digests…proteins…Substances.
12-Liver secretes…bile….juice.
13-A muscular sac works on mixing food up by its digestive juices is called…stomach…
14- salivary glands are …3…pairs.
15- Water is absorbed in ……rectum…….from food remains.
16- A common cavity leads to the esophagus is called …pharynex.
17- The system which distributes the digested food and oxygen all over the body cells is ....circulatory system….. system
18-saliva contain digestive substances called…enzymes
19-changing complex food into simple food called digestion
20- Bile juice help to digest…fat…into fatty emulsionu][/u[/[/u]u[/u]]