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1.Wich type of muscles is involved in the beating of the heart.
A.cardiac muscles
B.smooth muscles
C.skeletal muscles
D.all muscles

2.what happens to the muscles when they are not often used?
A.they become toned
B.they become strong
C.they become weak
D.they become big.

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Sagot :

1.Wich type of muscles is involved in the beating of the heart.

A.cardiac muscles

B.smooth muscles

C.skeletal muscles

D.all muscles

2.what happens to the muscles when they are not often used?

A.they become toned

B.they become strong

C.they become weak

D.they become big.