Which layer in the blood vessel is composed of smooth muscle, allowing it to dilate or constrict? Tunica intima
*Tunica media
Tunica externa
Endothelium

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.