Severe injury to skeletal muscle can be significant enough to raise CK-MB levels above normal, but such injury doesnât usually cause a high relative index. If your doctor suspects injury to both heart muscle and skeletal muscle, troponin is a more accurate test for identifying a heart attack.
The radial smooth muscle layer (dilator pupillae) is responsible for dilating the pupil. Source(s): http://en.wikipedia.org/wiki/Iris_%28ana...http://en.wikipedia.org/wiki/Dilator_pup...LaughingMan Â· 8 years ago.he iris is composed of two smooth muscle layers, arranged radially and circularly.
the synaptic trough found at smooth muscle is considerable bigger than we see at the neuromuscular junction of skeletal muscle. 1  the neurotransmitter is free to interact with any one of several smooth muscle cells because the synaptic trough is not as isolated as we saw in skeletal muscle.