Grade 3 E.V.S. Ch:6 Human Body N.B. work

 

New words

1. organs

2. internal organ

3. skeletal system

4. muscular system

5. digestive system

6. respiratory system

7. nervous system

8. circulatory system

9. hygiene

10. muscules

11. inhaled air

12. exhaled air 

13. infection

14. itching

15. uncovered

2. Name the following. 

a. A hard, bony covering that protects the brain. 

Ans. A hard, bony covering that protects the brain called the skull. 

b. A group of tissues in our body that performs a specific function.

Ans. A group of tissues in our body that performs a specific function is called an organ.

3. Answer the following questions in 3 to 5 sentences. 

a. What does hygiene mean?

Ans. Keeping yourself and things around you clean, in order to prevent disease.

 b. Give two examples each of external organs and internal organs.

Ans. The external organs, such as the skin  and nose are located outside the body, whereas internal organs, such as the heart, lungs are located within the human body. 

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c. How are organ systems formed ?

Ans.Our body is made up of many cells. Many cells of similar type come together and form tissues,tissues make up organs, and organs make up organ systems. 

d.How are muscles helpful to us?

Ans.Muscles help us to move, lift things, pump blood through our body and even help us to breathe. There are more than 600 muscles in our body.

e.Name the largest organ of our body.

Ans.The skin is the outer covering of the body. It is the largest organ of the human body.