★ Muscle Anatomy Quiz
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.
A. Muscle cell
B. Gland
C. Neuron
D. None of the above
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What is the contractile unit formed from Z line to Z line?
A. Sarcomere
B. T Tubule
C. Sarcoplasmic reticulum
D. Fascicle
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