7th Science Ch. 13

The smallest unit of organization of the body is the

• tissue

• cell

• organ

One job of the connective tissue is to

• carry messages

• digest food

• support the body

All body systems work together to

• control a cell's activities

• keep the body in balance

• cause stress

An example of a ball and socket joint is the

• knee

• shoulder

• elbow

Bones in movable joints are held together by

• ligaments

• cartilage

• muscle tissue

Which is one job of bones?

• make blood cells

• sense information about the environment

• protect the body from water loss

Muscles found only in the heart are called

• smooth muscles

• cardiac muscles

• skeletal muscles

When muscles contract, they get

• longer

• weaker

• shorter

Any push or pull is called

• work or force

• machine

• nothing

The knee joint in the human body works as a

• force

• fulcrum

• lever