Page 17 - E-Science Prim.4 2024-2025 U1 Con.1_Neat

Organ Function
Mouth
Digestion of food begins in mouth:
- Saliva: a liquid moistens and begins to
break food.
- Teeth: grind (crush) food.
- Tongue: mixes food with saliva.

A long muscular tube that carries food

Esophagus down from throat (pharynx)to the
stomach.

- A muscular organ.

- It has acid & enzymes (digestive

juices) that change food into soupy

liquid.

Stomach - Food stays few hours then stomach

muscles move it to small intestine.

- A long, winding tube up to 6 m long.

Small - The food is fully digested into
nutrients by juices of liver and
intestine pancreas.

- The wall of small intestine absorbs
nutrients through tiny blood vessels.
(Absorption)

Large - Undigested food flows into …………
intestine - A tube from small intestine to anus.
- It stores the wastes & absorbs water

from the undigested food.
- Wastes leave the body through anus.
- No digestion but absorption of water.

First Term 17