1. How does Ca2+ activate the contraction of striated skeletal muscles? it binds

Question

1. How does Ca2+ activate the contraction of striated skeletal muscles?

it binds to troponin C and causes tropomysin to bind to the myosin head

2. AF Treadmilling occurs when:

b. the concentration of actin filaments is above Cc (D)

c. the concentration of free actin subunits is below Cc (T)

d. the concentration of actin filaments is below Cc (D) and Cc (T)

e. the concentration of actin filaments is between Cc (D) and Cc (T)

Explanation / Answer

1. Option number 'b' is correct as the binding of calcium with tropomyosin causes exposure to the active site for muscle contraction

2. Option number "c" is correct for treadmiling to occur.

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