The cytoskeleton provides support in a cell. It is a network of protein fibers supporting cell shape and anchoring organelles within the cell. The three main structural components of the cytoskeleton are microtubules (formed by tubulins) , microfilaments (formed be actins) and intermediate filaments.
epinephrine binds to beta 2 receptors to relax airway smooth muscle and relaxes larger arteries to supply more blood to metabolizing tissues What is theophylline? an inhibitor of phosphodiesterase so it will potentiate the effect of epinephrine and inhibit cAMP breakdown to relax smooth muscle
The mechanism of action of epinephrine is as a sympathomimetic catecholamine acting on both alpha- and beta-andrenergic receptors. Of catecholamines, it is the most potent activator of alpha receptors resulting in intense vasoconstriction. Its beta receptor action promotes bronchial smooth muscle relaxation, resulting in significant bronchodilation.