G 3.1.3 Skeletons and movement

1 . Complete the sentences to explain how the muscles in your arm work. Use each of the words in the box once. When I lift a weight, the muscle at the front of my arm -------- and gets -------- The muscle at the back of my arm ------------ and gets longer the back of my arm --------- and gets --------- This shows that muscles work in -----

2. Label the drawing showing the changes in the arm muscles when you lower your arm.

3 Fill in the missing words to complete the sentences about how our muscles work.

Muscles work by ------- on the -------- they are joined to.

3 Fill in the missing words to complete the sentences about how our muscles work.

Muscles work in -------- When one muscle ----------.

3 Fill in the missing words to complete the sentences about how our muscles work. the other muscle --------- . The muscle that contracts gets muscle.

they are joined to. --------- The muscle that relaxes gets ------------ .

Underline the word that makes each of the sentences true.

The muscle that is working contracts/relaxes.

The muscle that is resting contracts/relaxes.

• The muscle that is working contracts/relaxes.

• The muscle that is working contracts/relaxes.

• The muscle that is resting contracts/relaxes.

• The muscle that is resting contracts/relaxes.

• The muscle that is resting contracts/relaxes.

a Which part of the body does each part of the model represent?A

b What happens to part C when you pull on part B?

Tags

NGSS.MS-PS2-1

Which part of the body does each part of the model represent?B

Which part of the body does each part of the model represent?c