Unit 2 - Bones, Muscles, Skin

What are the two main jobs of the skeletal system?

• support and protect the body
• digest food and carry messages for the body
• get rid of wastes and defend the body from disease
• sense changes in the environment and carry food through the body

Which activity does not use muscles?

• digesting an apple
• remembering a name
• jumping rope
• breathing air

Ella waves good-bye from the bus. What body system pulls on bones to let Ella wave her arm?

• muscular system
• nervous system
• digestive system
• circulatory system

Which organs do the ribs protect?

• stomach and lungs
• intestines and heart
• lungs and intestines
• heart and lungs

The number of bones in the adult human body is___.

• fewer than 50
• about 500
• about 200
• about 100

Bones support the body. What pulls and pushes on bones to move them?

• blood
• nerves
• muscles
• skin

Cardiac muscles is a special involuntary muscles only found where?

• Abs
• Heart
• Legs
• Arms

Voluntary or skeletal muscles are muscles we __________ control.

• can
• can't

Involuntary or smooth muscles are muscles we ___________ control.

• can

• can't

What are joints?

• A place where one bone meets

• A place where two bones meet and they allow bones to move

• Bones don't meet

• They connect bone to muscle and allow them to move