BIOL 1050H Lecture Notes - Lecture 11: Vas Deferens, Countercurrent Exchange, Triiodothyronine

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Mechanisms of communication between cells: gap junctions. Pores in cell membrane allow signaling molecules, nutrients, and electrolytes to move from cell to cell: neurotransmitters. Released from neurons to travel across synaptic cleft to second cell: paracrine. Secreted into tissue fluids to affect nearby cells: hormones. Chemical messengers that travel in the bloodstream to other tissues and organs. Endocrinology: the study of this system and the diagnosis and treatment of its disorders. Endocrine glands: organs that are traditional sources of hormones. Hormones: chemical messengers that are transported by the bloodstream, stimulate physiological response in cells of another tissue or organ, often a considerable a distance away. Exocrine glands: have ducts, cary secretion to an epithelial surface or the mucosa of the digestive tra(cid:272)t: (cid:862)exter(cid:374)al se(cid:272)retio(cid:374)s(cid:863, extracellular effects (food digestion) Endocrine glands: no ducts, contain dense, fenestrated capillary networks which allow easy uptake of hor(cid:373)o(cid:374)es i(cid:374)to (cid:271)loodstrea(cid:373) (cid:862)i(cid:374)ter(cid:374)al se(cid:272)retio(cid:374)(cid:863) Intracellular effects such as altering target cell metabolism.

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