BIOL 2160 Chapter : Chapter 1
Document Summary
1:30 pm: physiology, science of the normal function and phenomena of living things, primary cells/tissues, muscle, contraction, generation of force, nerve, epithelial, glands, exocrine glands, ducts leading to external environment, endocrine glands, ductless. Interior of body separated form external environment by a layer of epithelial tissue: apical side, towards lumen "top, basal side, towards basement membrane and blood "bottom" Lumen of respiratory system, gastrointestinal system, and urinary are part of external environment: exchange between external and internal environment, between blood and external environment. Lungs: gastrointestinal, kidneys, all exchange is 1 cell thick, body fluid compartments. Interspatial fluid (isf: extracellular fluid (ecf, connective, homeostasis, process of maintaining stable internal environment compatible for life, exception: reproductive system, negative feedback, primary mechanism for maintaining homeostasis. Set point: desired level of regulated variable. Sensors detect level and provide input to integrating center. Figure 1. 6c,d: positive feedback, child birth, blood clotting, homeothermic animals, normal body temp, 37 c, hypothermia, decrease in body temp, hyperthermia.
