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 Dilated Eye Exam. The view to the back of the eye is limited when the pupil is not dilated. When your pupil is small, an ophthalmologist can see your optic nerve and macula but the view is limited. In order to see the entire retina, the pupil must be dilated. This is achieved through the use of eye drops.