Answer:
I think it is the heart contracts and expands to move blood
Explanation:
This is the only when that is having a physical force
Tetramer
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Answer:
Muscle rigidity, also known as muscle tension, rigor, or stiffness, is one of the most common causes of muscle pain. It's characterized by the inability of the muscles to relax normally. The condition can affect any of the muscles in the body, causing sharp pain that makes it difficult to move.
Explanation:
