Biology, asked by rockdart5893, 10 months ago

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
(1) Calcium (2) Magnesium (3) Sodium (4) Potassium

Answers

Answered by ashlytlipson2002

1

the answer is

calcium

Calcium is the ion released into the sarcoplasma from sarcoplasmic reticulum during the polarisation. Ca++ attaches to the Troponin-C. This brings a confirmational change in the tropomyosin. As a result unmasking of active sites on actin for myosin takes place. Cross bridges are formed between actin and myosin. This results in muscle contraction.

Magnesium is used in phosphorylation reactions involving ATP.

Sodium and potassium help in maintaining the membrane potential.

hope this help you

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