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.
1 When performing a pupillary exam, it sometimes helps to illuminate pupils indirectly from the side, so you can actually see what is happening. 2  Observe the pupil size and shape at rest, looking for anisocoria (one pupil larger than the other). 3  Observe the direct response (constriction of the illuminated pupil).