Bones make up your skeleton, and ____________ move your skeleton.

• muscles

• the eyes

• the backbones

Besides supporting you, your bones ____________the inside of your body.

• relax

• protect

• heat

Your bones are conected at ___________.

• voluntary muscles

• the joints

• the tendons

Elastic tissues called _______________ attach your muscles to your bones.

• joints

• smooth muscles

• tendons

To move a part pf the body, one muscle tightens and its partner _________________.

• cushions

• relaxes

• contracts

Blood is made mainly of red blood cells, white blood cells, platelets, and __________.

• plasma

• carbon dioxide

• oxygen

Plasma helps the ___________ stay warm.

• muscles

• brain

• body

• feet

Red blood cells pick up ______ and take it back to the lungs.

• oxygen

• carbon dioxide

• water

• trash

When cells die at a wound or from disease, ___________carry them away.

• red blood cells

• platelets

• plasma

• white blood cells

Sticky threads made by ___________ help close up holes made by cuts or wounds.

• plasma

• DNA

• platelets

• bones