Answer:
Isotonic contractions maintain constant tension in the muscle as the muscle changes length. This can occur only when a muscle's maximal force of contraction exceeds the total load on the muscle. Isotonic muscle contractions can be either concentric (muscle shortens) or eccentric (muscle lengthens).
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You have to give him time don’t force it on him let him make his own decisions and maybe he will be with you but you can’t force him into it. :)
We have 5 vital organs heart kidneys liver and lungs. The human brain is the body’s control center so it’s a major role in the human body.