ANP 1105 Lecture Notes - Lecture 8: Blood Sugar, Autonomic Nervous System, Circulatory System

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Chemical substance released into the ecf that regulates the metabolic function of other cells in the body. Hormone is an agent that act at long distances. Positive feedback: response of mechanism enhances original stimulus output is further stimulated, change occurs in same direction as original response, goal to be attained, eg: blood clotting. Most disease seen as a disturbance of homeostasis = homeostatic imbalance aging associated with progressive decrease in our ability to maintain homeostasis greater risk for illness. Mechanism of hormone action: hormones alter levels of cell activity: Synthesis of enzymes within cells (regulating levels of important cytoplasmic proteins; endpoint of steroid receptors) Stimulation of mitosis (cell division; growth hormone that pushes it into cell division) 3 structural groups of hormones: (i) amino acids, peptides, proteins (lh, rh) (ii) steroid hormones (derivatives of cholesterol) (would refer to the sex hormones, stress hormones) (iii) eicosanoids (from arachadonic acid)