Which structure is the contractile subunit of the myofibril in a skeletal muscle cell?
A) Sarcoplasmic reticulum
B) Sarcomere
C) Myosin
D) Motor end plate
Answer: B
Which structure is the contractile subunit of the myofibril in a skeletal muscle cell?
A) Sarcoplasmic reticulum
B) Sarcomere
C) Myosin
D) Motor end plate
Answer: B