Answer:
The atria and ventricles are separated by the mitral and bicuspid valves.
Explanation:
The atria undergo atrial systole, a brief contraction of the atria that ejects blood from the atria through the valves and into the ventricles.
Answer:
Your body needs calories just to operate — to keep your heart beating and your lungs breathing. As a kid, your body also needs calories and nutrients from a variety of foods to grow and develop. And you burn off some calories without even thinking about it — by walking your dog or making your bed.
Explanation:
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