HumanBodySystems-Responses

//DO NOT POST YOUR QUESTION HERE.// What happens if the a valve does not keep the blood from going back to where it came from (for example, if blood goes back into the right atrium from the right ventricle)?
 * QUESTIONS**

Can a heart beat even if it's out of the body?

Why do people donate parts or all of their bodies to science?

Why would it be dangerous if a piece of food went down your trachea instead of your esophagus?

If my neck hurts, does it mean my bones have gone bad?

Our neck is the connection of brain and chest, arm, legs, etc. right? Then when you break your neck badly, does it mean your brain cannot send messages to your other body parts and you cannot move your body??

Why does our heart beat faster when we are anxious or surprised?

When you burp, why does it smell bad?

If you crack your back, can that break your bones at the place you had cracked it?

Is it normal when your heart hurts sometimes?

Why does my stomach gurgle when im hungry?

Why does our heart beat a double beat instead of a single beat?

Are problems with your kidneys (like kidney stones) or spinal problems (like scoliosis) genetic?