When Ca²⁺ is present at high levels in the sarcoplasm of striated muscles,then
A)TnI has a strong interaction with actin.
B)TnC has a strong interaction with TnI.
C)TnT has a strong interaction with myosin.
D)TnT has a weak interaction with Ca²⁺.

Question

Quizplus · Accepted Answer

When Ca²⁺ is present at high levels in the sarcoplasm of striated muscles, it binds to troponin C (TnC), which then strengthens the interaction between TnC and troponin I (TnI), facilitating muscle contraction.

When Ca²⁺ Is Present at High Levels in the Sarcoplasm