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Why do we have so many alveoli?

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37.2 trillion for an average human.

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What do veins connect to?

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when you have a cut how does it stop bleeding

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What would happen if we didnt have blood

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What happens if your veins get cut or ripped?

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they make the journey through capillaries, venules, and veins

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they make the journey through capillaries, venules, and veins

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the heart doesn't "make" blood, it pumps blood 

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the heart doesn't "make" blood, it pumps blood 

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a person can only have two hearts if they were conjoined twins

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a person can only have two hearts if they were conjoined twins

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You get very sick, and maybe start throwing up 

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You get very sick, and maybe start throwing up 

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your body response to bad food intentionally makes you throw up, or, per se, doesn't make you feel good for awhile

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vomit is an acid, because you are essentially throwing up stomach acids 

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vomit is an acid, because you are essentially throwing up stomach acids 

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You get nausea, and other problems not going into detail

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You get nausea, and other problems not going into detail

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Is it possible to have two hearts?

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What are white blood cells made out of?

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What if we swallow something and it gets stuck in our throat?

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What happens if we digest unedible things?

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What would happen if our body didnt absorb nutrients, proteins, fats

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What happens to our body when we throw up

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what happens if we breath something we are not supposed to be breathing 

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what happens if we breath something we are not supposed to be breathing 

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How does our saliva get food down our throat

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hydrochloric acid is what its made out of 

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hydrochloric acid is what its made out of 

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How does are vomit come up to are mouth so fast?

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What if we eat someting that is non-edible?

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How does it get the nutrients the body needs and get rid of everything else

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What happens when you digestive system is not digesting food?

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is vomit an acid?

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Why can't we digest corn?

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How long does it take for the stomach to break down food?

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How long does it take for the stomach to break down food?

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How many acids are in our body

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How does the stomach acid become acid?

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How do bones mend or fix themselves when they are solid?

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How do muscles grow?

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Does the air we breathe have cells?

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does the air we breathe have cells

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How does are body know if  it bad or good food?

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are their other things in our body other then cells? 

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are their other things in our body other then cells? 

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How many cells do we have inside of us?

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How do cells produce/generate?

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Are there more cells than white and red cells?

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do we digets every thing that goes in us?

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do we digets every thing that goes in us?

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How much cells do we have?

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What happens when something bad is digested?

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How do we digest foods

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How does the full digestive system work?

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If we break a bone how can it be fixed?

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What is stomach acid made out off

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how come we cant bend our body all the way. 

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how come we cant bend our body all the way. 

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Does The heart Produce its own blood?