The contraction of skeletal muscles exists based on myosin cross-bridges binding to actin and transitioning from a high-energy to a low-energy state.
Exposure of the retina to light hyperpolarizes the rods and cones, removing the inhibition of their bipolar cells. The now-active bipolar cells in turn have the ganglion cells, which transmit action potentials along their axons (which exit the eye as the optic nerve).
Excluding reflexes, all skeletal muscle contractions happen as a consequence of signals emanating from the brain. The brain transmits electrochemical signals through the nervous system to the motor neuron that innervates several muscle fibers.
Therefore, the correct answer is option D) myosin cross-bridges binding to actin and transitioning from a high-energy to a low-energy state.
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