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
What does epinephrine do in a lidocaine injection? constricts blood flow in capillaries via alpha 1 receptor (same as phenylephrine or over the counter cold remedies which are alpha 1 agonists) What does epinephrine do in an inhaler or endogenous epinephrine? dilate airway smooth muscle or large blood vessels via beta 2 receptors What are the 5 types of muscarinic receptors that mediate PNS control in different tissues?