BMED 3100 Lecture Notes - Lecture 3: Thalamus, Basal Ganglia, Cardiomegaly
Document Summary
Homeostasis maintains internal stability regulation of the body"s internal environment in response to an eternal and/or internal change keeping internal environment stable. Loss of homeostasis is sensed by organism - if not compensated for and homeostasis is not reestablished, illness/disease exists. An imbalance/stimulus produces change is sensed by a receptor and sent to a control center and then to an effector. the response of the effector feeds back to influence the magnitude of the stimulus and fight the stimulus. High body temp sensed by cells in skin and brain, sent to thermoregulatory center in brain (cc) and then to sweat glands to lower temp. Are intracellular (icf) and are extracellular (80% interstitial fluid, 20% plasma. 60% of weight is water - 40% of weight is icf and 20% is ecf permeable barrier b/w icf and ecf. Hydrophobic tails facing inward (lipid), hydrophilic phosphate head. Detects chemical signals; anchors cells to adjacent cells and ecf.