[BIOL 2230] - Midterm Exam Guide - Everything you need to know! (85 pages long)
6 Feb 2017
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Both respond to stressors, return to homeostasis. Nervous system: uses electrochemical impulses, action potentials, can only affect excitable tissue (glands, skeletal, smooth, cardiac muscle, can respond within milliseconds, prevented from functioning for a long time, adapts quickly to continued stimuli. Exocrine: have ducts, involved with the digestive processes, sweat and oil glands, saliva, not hormonal glands, do not secrete endocrine secretions. Endocrine: secrete hormones, ductless, highly vascularized glands (goes through the bloodstream, some glands have both endocrine and exocrine. Can generate nervous impulses but can also secrete chemical messengers that can cause other chemical messengers to be produced. Hormones: long-distance chemical messengers, chemical that is produced in one part of the body but exerts its effect at another part of the body. Autocrines: a chemical that is produced by a cell that changes the activity of that cell, very localized signaling molecule. Paracrines: also localized, chemical signals secreted by cells that affect the neighboring cells.
