But when they are asked to pull on a weight, their muscles respond with nearly full strength.

Desperately he tried to move, but the muscles would no longer respond.

My muscles no longer respond quickly enough to the brain's message.

He tried to move but his muscles would not respond.

"I feel very old right now," she said, trying to make stiff muscles respond.

My heart stood still at the thought, but mind and muscle responded to the quick decision I was forced to make.

But the muscles of her mind would not respond.

His muscles responded as though they belonged to a stranger.

The muscles would not respond to the urgent calls from his brain.

He just couldn't get muscles to respond in arms and legs.