Answer :

ShyzaSling

Answer:

the contractile unit of a muscle cell - sarcomere

contains calcium that is released during a contraction- Sarcoplasmic reticulum

composed of a contractile protein,actin, and two regulatory proteins, troponin and tropomyosin - thin myofilament

Is composed of the contractile protein myosin- thick myofilament

the muscle cell membrane- Sarcolemma

Answer: its fats,protiens,coplex carbo,carbohydrates,

Explanation:

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