What are the roles your talking about
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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The Retina is a layer in the back of the eye which contain cells that are sensitive to light and trigger nerve impulses to be received by the brain which causes visual images to be formed
I believe the answer is - Visual, manual, and cognitive
