Integumentary and Nervous Systems

How many skin cells do you have covering your body?

• About ten thousand

• About one million

• About ten million

• Billions and billions

How does the body make new skin?

• Through the division of existing skin cells

• By recycling old skin cells

• By changing blood cells into skin cells

• By existing skin cells getting bigger

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What can you conclude from the fact that your skin prevents harmful germs from entering your body?

• Without skin, your immune system wouldn't function

• Germs can enter your body through cuts and scrapes

• Wearing heavy clothes will protect you against most diseases

• Your skin cells contain powerful antibiotics

Which bodily system — parts of which can be found in the skin — is responsible for your sense of touch?

• The immune system

• The muscular system

• The nervous system

• The endocrine system

What might happen if your body lacked neurotransmitters?

• Your nerve cells could not communicate with one another

• Impulses could not travel along your nerve cells.

• You would not be able to touch the objects that surround you.

• Your nerve cells would begin dying off.

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If an area of your body is particularly sensitive, what can you conclude about that area?

• It contains more skin cells than other areas of your body.

• It contains more neurotransmitters than other areas of your body.

• It conducts electricity better than other areas of your body

• It contains more nerve endings than other areas of your body.

How are neurotransmitters different from the impulses that travel along the bodies of nerve cells?

• The impulses are electrical; neurotransmitters are chemical.

• The impulses travel at a faster rate than neurotransmitters.

• The impulses send signals from the body to the brain; neurotransmitters send signals from the brain to the body.

• The impulses occur constantly; neurotransmitters are released only occasionally.

Where in your body do you find nerve cells? Choose the best answer.

• In your brain

• In your spinal cord

• In your neurons

• In all parts of your body

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A disorder called CIPA prevents certain people from feeling pain. What can you infer about these people?

• They are capable of amazing feats of strength.

• Their brains do not function properly, so they can't think clearly

• . They often injure or burn themselves without realizing it.

• They tend to live extremely long lives

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What does the nervous system do?