SCIENCE

UNIT 1 NUTRITION

1.   What nutrients do our bodies need?

Carbohydrates, fats, proteins, vitamins and minerals.

2. Do we use all the food that we eat?

No, we don’t. We eliminate other substances we don’t need by the excretory and the digestive.

3. What are the organs in the digestive system?

Mouth, salivary glands, pharynx, oesophagus, stomach, small intestine, liver, pancreas, large intestine, appendix, rectum, anus.

4. What do we need food for?

Food provides us with the nutrients we need.

5. What does our body do with food in our stomach?

The stomach squeezes and mixes food with juices.

6. Why do we mix food with saliva?

Because saliva, contains an enzyme. The enzyme helps break the food into pieces.

7. What is absorption and where do the nutrients enter the blood?

During the process of absorption, the nutritional substances enter the blood vessels through the thin walls of the small intestine. Now blood can carry nutrients around the body.

8. How many teeth have we got?

Children have 20 first (or milk) teeth. From about the age of six, 32 permanent teeth.

9. What is digestion?

The physical process that changes food into nutrients.

10. What is the function of saliva?

The saliva contains an enzyme which helps break the food into pieces.

   11. What does the small intestine do?

The small intestine has thin walls and nutritional substances enter the blood vessels through these walls. We call this process absorption.