Ch 2 metabolism review

What 3 molecules do cells need to be healthy?

• Glucose

• Carbon Dioxide

• Water

• Amino Acids

• Oxygen

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What does the digestive system do in a healthy body?

• Takes in oxygen

• Breaks down food into blood cells

• Breaks down food into amino acids and glucose

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Stella's respiratory system is not working well. Why is this a problem for her ability to exercise?

• Her respiratory system will not be able to break down molecules from air into oxygen.

• Her cells will not work well when they have low levels of oxygen.

• Her digestive system will have to work twice as hard to get the same amount of energy from glucose molecules.

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Some types of syrup are almost entirely made of glucose molecules. If a person ate some syrup like this, what would happen to her ability to exercise?

• It would be harder for her to exercise because her digestive system would need to use more enzymes to combine the glucose molecules together

• It would be easier for her to exercise because glucose moves through the circulatory system faster than other food molecules usually do.

• Nothing would happen to her ability to exercise, but her digestive system would not work as hard, since glucose is already small enough to get to her cells.

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Some problems with the digestive system make it very difficult for the body to digest enough food. Why would it be harder to exercise when you have a digestion problem like this?

• You would not be able to sleep, which would make you too tired to exercise.

• Your cells would have molecules from air, but would not get enough molecules from food.

• You would not get any of the molecules your cells need to exercise.

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Cade thinks that his body only works right when cells are getting molecules from food and molecules from air. Is he correct?

• Yes, the body only works with both kinds of molecules (food and air).

• No, the body works when cells get molecules from different kinds of food.

• No, the body only works when the stomach gets molecules from food and the lungs get molecules from air.

• No, because cells make all the molecules they need.

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My friend Renee has asthma, a condition that makes it hard to breathe. Would it be hard for my friend to exercise?

• yes, if she has enough sleep, she can make enough energy.

• No, as long as she has her inhaler, she can exercise.

• No, the person's cells may not have everything they need, but her body can still exercise.

• Yes, it will be difficult for my friend to exercise because she needs molecules from air in her cells.

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Rebecca has been eating lots of healthy foods, but can't seem to breath as well as she usually does. Can she still exercise normally?

• No, her cells do not have enough oxygen to react with proteins to release energy.

• No, her cells do not have enough oxygen to react with glucose and release energy.

• Yes, Rebecca can get all she needs from the molecules in food.

• No, her digestive system cannot break down carbohydrates.

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Eric ate a big bowl of rice (a starch) before seeing his doctor since he was feeling tired all the time. A medical test determined he had normal levels of oxygen but low levels of glucose. Does this explain why he is tired?

• Yes, Eric's respiratory system is working but his digestive system is not turning oxygen into glucose.

• No, something else must be wrong with Eric because his cells have all the molecules they need.

• Yes, his digestive system is working, but his respiratory system has too much oxygen, so his body stopped making energy.

• Yes, Eric's respiratory system is working, but his digestive system is not breaking starch down into glucose.

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Mr. T was tested and Doctors found that his cells had normal levels of oxygen and glucose, but no starch molecules. Will he be able to exercise?

• Yes, the glucose and oxygen can react to release energy.

• No, his digestive system is not breaking down food.

• No, his body systems are working, but he needs to eat better foods.

• Yes, as long as he has glucose, his cells don't need anything else.

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