BIOL 1001 Chapter : Biology Chapter 6
Document Summary
Chapter 5 chemical messengers: mechanisms of intercellular communication, direct communication through gap junctions indirect. Communication through chemical messengers: cap junctions fig 5. 1 channels formed between 2 cells. Direct electrical and metabolic coupling common in smooth and cardiac muscle. Classification of messengers synthesis and release of chemical. Paracrines released by cell, moves to target cell by diffusion paracrines- act on neighboring cells 3 examples: Act locally very potent in small amounts activate or inhibit adenylate cyclase. Messengers of nervous system: released from neuron by exocytosis diffuses to very close target cell across a synapse hormones messenger of endocrine system, released from endocrine gland into blood, transported in blood to target. Target cell = cells in body with receptors specific to the hormone. Neurohormones: hormones released from the axons of neurons adh & Involved in cell development, differentiation, and immune response. Often act on a wide range of targets.
