5.two upper chambers known as the left atrium and right atrium and two lower chambers called the left and right ventricles.
6.If the heart is severely injured, people often die before they can be treated. However, many injuries worsen over hours or even longer. A tear in the wall of the heart (ventricular rupture) often causes fatal bleeding before people can be taken to a hospital.
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Answer:
3.blood, Left ventricle, Valve and left anrium
I'm not sure if that's anrium hehhehe
Answer:
5.two upper chambers known as the left atrium and right atrium and two lower chambers called the left and right ventricles.
6.If the heart is severely injured, people often die before they can be treated. However, many injuries worsen over hours or even longer. A tear in the wall of the heart (ventricular rupture) often causes fatal bleeding before people can be taken to a hospital.
I'm not sure but I hope it's help