[PHGY 213] - Final Exam Guide - Comprehensive Notes fot the exam (46 pages long!)
30 Mar 2017
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Vertebrate nerves: consist of thousands of axons, fibers can be large and myelinated (15-25um) or small and unmyelinated (0. 2um, all conduct non-decremental action potentials --all-or-none response. Invertebrate nerves can consist of a single axon: fiber diameter can be up to 1000um and fibers may be myelinated or not, all conduct non-decremental action potentials. Strength-duration curve: both strength and duration of stimulus affect ease with which membrane can be stimulated. Inversely related --as strength of current increases, time required to stimulate decreases (inverse curve, hyperbolic shape) Endocrine organs: hypothalamus, anterior & posterior pituitary, thyroid & parathyroid. Hypothalamic-pituitary signaling: via blood vessels of the pituitary stalk, hypothalamic-hypophyseal portal system: from the hypothalamus to the adenohypophysis (anterior pituitary, hypothalamic neurohormones either activate or inhibit activity of one of the. 6 types of hormone-producing cells in the anterior pituitary: called either releasing hormones (releasing factors) or inhibiting hormones (inhibiting factors) Classes of hormones: hormones are divided into classes based on their structure.
