Science muscles

They are soft, elastic and thin organs that cover the bones

• the bones

• the muscles

Choose the picture that represents a CONTRACTED muscle

• 
• 

Choose the picture that represents a RELAXED muscle

• 
• 

Muscles become shorter and thicker when they relax

• TRUE

• FALSE

Muscles are classified in:

• voluntary and involuntary

• Relaxed and contracted

Examples of involuntary muscles:

• 
• 

We can control them and move them when we want:

• Voluntary muscles

• Involuntary muscles

What system controls muscles in vertebrates:

• The skeletal system

• The nervous sytem

They allow body movement in vertebrates:

• muscles

• bones

Muscles have the capacity of contracting and stretchingto produce movements:

• TRUE

• FALSE