Question

question 8
which of the following generates the force of contraction of skeletal muscle cells?
a myosin cross - bridges bind to actin
b myosin filaments coil up and shorten
c sarcomeres coil up and shorten
d actin cross - bridges bind to myosin
question 9

Explanation:

Muscle contraction occurs when myosin cross - bridges bind to actin. This binding forms cross - bridges that pull on the actin filaments, causing muscle contraction. Myosin filaments do not coil up and shorten (B is wrong). Sarcomeres shorten but not by coiling (C is wrong). Actin does not have cross - bridges (D is wrong).

Answer:

A. myosin cross - bridges bind to actin