When skeletal muscle contracts, which component does the Ca²⁺ released from the sarcoplasmic reticulum bind to
When skeletal muscle contracts, which component does the Ca²⁺ released from the sarcoplasmic reticulum bind to?
A. Actin
B. Troponin C
C. Troponin I
D. Troponin T
E. Tropomyosin
Answer: B
Explanation: During skeletal muscle contraction, Ca²⁺ released from the sarcoplasmic reticulum specifically binds to troponin C, which triggers a conformational change in the troponin-tropomyosin complex, exposing the binding sites on actin for myosin.
