EHS 385 Lecture Notes - Lecture 25: Thyroid Hormones, Adipose Tissue, Autonomic Nervous System
17 Dec 2017
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Document Summary
Work (j) = force (n) x distance (m) power (w) = work (j) / time (s) ergometry: used to measure work and power: cycle, arm, bench step ergometers, treadmill. Homeostasis = maintenance of constant and normal internal environment. Steady state: physiological variable is unchanging, not necessarily normal : balance b/t demands placed on body and body"s response to those demands, ex. Positive feedback = response increases original stimulus (most control systems) Negative feedback = response reverses initial disturbance in homeostasis. Juxtacrine: chemical messenger passed b/t two connected cells. Autocrine: chemical messenger acts on same cell. Endocrine: chemical messengers released into blood, only affect cells w/specific receptor. Catalysts that regulate speed of reactions, lower energy of activation. Glycolytic enzymes act in cytoplasm, while oxidative enzymes act in mitochondria. Factors that regulate enzyme activity: temp and ph. Atp-pc system: immediate source of atp: pc + adp creatine kinase atp + c. Glycolysis: glucose 2 pyruvate or 2 lactate.
