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How much blood does the heart pump out a day? What if your heart pumps out too much blood? What happens if your heart beats too fast?
What happens to the lungs when you have asthma?
Why is it hard to breath if you have asthma?

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Heart: What would happen if your heart rate is dangerously high?
Lungs: Do both liungs have different jobs; could you survive with only one lung?

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what would happen if our heart did not have valves.

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When you are running hard/fast for a long time, why is it hard to breath?

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does a lot of sugar or food change your heart rate!

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does a lot of sugar or food change your heart rate!

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why are our lungs saxed,
& do they have to be saxed.

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how close are the heart and the lungs?
if someone has less than 60  bpm
would it mean?
how is the air you breathe split up between the lungs?

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1) Does lots of little sugar impact your heart rate?
2) Is there any difference in lung capacity for men and women.
3) Is it possible to have fake lungs or heart.

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1) how do the lungs oxygenated are blood.
2) Why does the heart have multiple chambers

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How many valves does the heart have inside it also going out?  Could you survive with one lung?

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How does having a bigger heart have a difference on your body?
Do any animals live on 1 lung or more than 2 lungs?

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what are veins for?
what cleans the inside of the lungs? what is the maximum heart rate before you die?

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1) what happens if you have over 100 bpm
2) if you are an animal does your heart rate change
3) can you survive with half a lung

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How long could someone survive with one lung?
How much blood

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How do your lungs in the respiratory system affect your breathing?

If your vains  got cut would your heart produce the blood which is coming out you?