B6A11Coordinate

Series of action potentials conducted to axon

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Unformatted text preview: and another neuron or an effector cell (muscle or gland). • Synaptic cleft: a slight gap between the presynaptic cell (axon terminus) and the postsynaptic cell. • Series of action potentials conducted to axon terminus fi causes exocytosis of vesicles containing a chemical messenger (neurotransmitter) into the synaptic cleft. . • Neurotransmitter binds to a receptor protein on the surface of the effector cell fi turns on the receptor . • The intracellular portion of the activated receptor causes a response in the postsynaptic cell. Endocrine Glands and Hormones • Endocrine glands may be of epithelial or neural origin. • Secrete biologically active molecules into the blood. – Lack ducts. •Exo crine glands: secrete via ducts “out” of body Heyer •Endo crine glands: secrete into bloodstream • Bloodstream carries hormones to target cells that contain specific receptor proteins for that hormone. • Target cells can respond in a specific fashion. 5 Coordination of Body Functions Some glands are both exocrine and endocrine. Pancreas • Acinar cells produce digestive enzymes. Some glands are both exocrine and endocrine. Gonads – Ovaries & testes – Secreted via bile duct into small intesti...
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This note was uploaded on 09/02/2011 for the course BIOL 6a taught by Professor Staff during the Fall '10 term at DeAnza College.

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