The Human Body

Bones are __________.

Check all that are true.

• not important in protecting organs

• made only from nonliving minerals

• made from living tissue

• made from living cells

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NGSS.MS-LS1-1

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Which of these is NOT a function of the skeletal system?

• helping move the body

• supporting the body

• protecting parts of the body

• sending messages to the brain along the bones

Skeletal muscles work __________ to ________________ and relax.

• alone; contract

• alone; expand

• in pairs; expand

• in pairs; contract

Which of these body parts is made of smooth muscle tissue?

• 
• 
• 
• 

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NGSS.MS-LS1-3

Which of these does NOT rely on the muscular system?

• moving the toes

• circulating the blood

• sending messages to the brain

• breathing

Which statement is false?

• The bronchial tubes get smaller as they spread farther into the lungs.

• The air sacs remove carbon dioxide from the blood vessels.

• The lungs breathe without the help of other muscles.

• Air enters the body through the nose and mouth.

What part of the respiratory system would the picture above be most similar to?

• air sacs

• trachia

• lungs

• pharynx

Blood goes toward the heart in __________ and away from the heart in __________.

• arteries; veins

• arteries; arteries

• veins; arteries

• nerves; veins

Which of the following would you expect to find inside the blood of the circulatory system?

Check all that are true.

• carbon dioxide

• oxygen

• nutrients

• neuron cells

How does the body stop blood that carries carbon dioxide from mixing with blood that carries oxygen?

• A wall of muscle separates the left and right halves of the heart.

• The heart is able to absorb oxygen and carbon dioxide from the air.

• The heart has four chambers that can decide what type of blood they take.

• none of the above