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 middle layer is the muscularis. This consists of smooth muscle. There is an inner longitudinal, middle circular and outer longitudinal layer of smooth muscle. The outer longitudinal layer is not present in the entire ureter. The main function of the muscularis is peristalsis which propels the urine.