BIO270H1 Chapter Notes - Chapter 4: Golgi Apparatus, Autocrine Signalling, Extracellular Fluid
Document Summary
Chapter 4 cell signaling and endocrine regulation. Communication occurs when a cell sends a signal to a target cell in the form of a chemical messenger. Messenger chemical binds to receptor it cell changing its shape and activating it. Gap junctions - channels that span the area of the membrane between adjacent cells. Specialized proteins that connect cytoplasm of 2 cells. Pheremone chemical messenger released into the external environment (members of the same species) Allochemicals are for members of a different species. Aqueous cytoplasm lipid membrane aqueous extracellular. Specialized ways of achieving the same result. Differ in cells involved, the way messenger is transported and signaling distance. Autocrine and paracrine signals move by diffusion. Endocrine system use circulatory system and nervous system using synapses. Long distance chemical communication occurs between pheromones and allochemicals . Exocrine glands secrete chemicals into ducts that lead to the surface of the body.