Metabolism Review

An athlete thinks that she can exercise as long as she eats different types of food because her body just needs different types of food molecules to work properly. Is the athlete correct?

• Yes, her cells only work when they have molecules from different types of food. 
• No, her muscles do not need molecules from food because all cells make all the molecules they need. 
• No, all cells need molecules from food and molecules from air to work properly.
• No, only her stomach cells need food molecules to work properly. 

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Marisol has been chewing and swallowing her food, but her digestive system is not doing what it usually does. Why is this a problem for her ability to exercise?

• Her cells will not work well because molecules from her food are not being broken down small enough to get to her cells.
• Her body will run out of energy because molecules from the air are not being combined into larger molecules for the cells.
• Her respiratory system will have to work twice as hard to break down molecules from food.
• Her cells will not work well because the molecules from food will be too small for cells to use.

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If a person is breathing normally, which of the following could prevent him from using his body to exercise normally?

• not getting enough sunlight, because cells need sunlight to function
• not getting enough sleep, because the body only makes energy for exercise while asleep
• not eating enough food, because cells need molecules from both food and air to work
• nothing, because he would be able to exercise normally as long as his cells are getting molecules from the air

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Rico, a scuba diver, uses breathing gear to help him breathe air underwater. He always gets enough sleep and eats a good breakfast before a dive. What could happen if his breathing gear broke during a dive and he could not breathe as much air as usual? 

• It would be difficult to swim, because his cells cannot work without molecules from air.
• It would not affect him because his cells are getting the different types of molecules they need from food to work properly.
• It would not affect him as long as he slept enough.
• It would not affect him because his body can function normally even if his cells do not have molecules from air.

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What does the digestive system do?

• Breaks down and handles food
  
  
• Pumps blood throughout the body
• Helps you breathe
• Helps your arms and legs move

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With circulation, the heart provides your body with which of the following? Choose the best answer. 

• oxygen
• nutrients
• a way to get rid of waste
• all of the above

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Skeletal muscles work with bones to give your body...

• strength
• the ability to move
• strength and the ability to move
• shape and form

The nervous system is made up of these three parts:

• Brain, heart, and spinal cord
• Brain, spinal cord, and nerves
• Nerves, arteries, and veins
• Nerves, liver, and heart

Which part of the body is the control center for the nervous system? 

• spinal cord
• stomach
• brain
• heart

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A group of tissues that perform a similar function is called_____. (Examples include the heart, lungs or stomach)

• cells
• tissues
• organs
• organ system

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