The functional unit of muscle contraction is the: a. sacromere b. myofibril c. m

Question

The functional unit of muscle contraction is the:

a. sacromere

b. myofibril

c. myofilament

d. muscle fiber

e. T-tubule

Which ion is responsible for exposing the active sites on actin?

a. Sodium

b. Potassium

c. Calcium

d. Hydrogen

e. Chloride

Exposing skeletal muscle fibers to ? removes ions and ATP from the cells and disrupts the troponin-tropomyosin complex such that it can no longer block the active sites on the actin molecules.

When muscle contraction occurs, what happens to the thick filaments and the thin filaments?

Explanation / Answer

Functional unit of muscle contraction is is the Sarcomere which shortens and lengthen during muscle contraction and relaxation.

Calcium ion is responsible for exposing the actice aites on actin.

Exposing skeletal muscle fibers to GLYCERINE removes ions and ATP from the cells and disrupts the troponin-tropomyosin complex such that it can no longer block the active sites on the actin molecules.

During muscle contraction the thick and thin filaments undergo sliding. The actin filaments slide over the thick filaments. The thick filament pulls the thin filaments over them leading to shortening of Sarcomere and causing muscles to contract

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