This preview shows page 1. Sign up to view the full content.
Unformatted text preview: cell. Some gated ion channels respond to electrical signals instead of ligands. Some receptor proteins are intracellular. Intracellular signal receptors are found in the cytosol or nucleus of target cells. To reach these receptors, a chemical messenger passes through the target cell’s plasma membrane. Such chemical messengers are either hydrophobic enough or small enough to cross the phospholipid interior of the plasma membrane. Hydrophobic messengers include the steroid and thyroid hormones of animals. Another chemical signaling molecule with an intracellular receptor is nitric oxide (NO), a gas whose small size allows it to pass between membrane phospholipids. Testosterone is secreted by the testis and travels through the blood to enter cells throughout the body....
View Full Document
This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.
- Fall '10