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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
• Secrete biologically
active molecules into
– 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
proteins for that
• Target cells can
respond in a specific
fashion. 5 Coordination of Body Functions Some glands are both exocrine and endocrine.
• Acinar cells
digestive enzymes. Some glands are both exocrine and endocrine.
– 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.
- Fall '10