What ordinarily prevents extensor muscles from contracting at the same time as flexor muscles?
A) The ligaments and tendons that bind them together
B) Learned patterns of coordination in the cerebral cortex
C) Inhibitory synapses in the spinal cord
D) Control of both muscles by different branches of the same axon

Question

Quizplus · Accepted Answer

Inhibitory synapses in the spinal cord prevent extensor muscles from contracting at the same time as flexor muscles. This is known as reciprocal inhibition and helps to coordinate smooth and purposeful movements.

What Ordinarily Prevents Extensor Muscles from Contracting at the Same