Anatomy and Physiology I organization and homeostasis-F14 (1).ppt

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Unformatted text preview: Anatomy and Physiology I Organization, Systems, Homeostasis 1 Anatomy Gross Regional Microscopic Systemic Surface Developmental Physiology Many subdivisions including: cellular, organ system, whole body 2 Levels of Structural Organization in the Body Atom Chemical/Molecule Organelle Cell Tissue Organ Organ System Organism Know Table 1.1 in textbook! 3 Homeostasis Ex: Normal human body temperature is 98.6 degrees F. Increase the temperature and the body activates mechanisms to dump heat – sweating. Decrease the temp. and the body activates mechanisms to produce and conserve heat like shivering. ** All medical treatment is aimed at regaining homeostasis. ** 4 Lack of oxygen due to exercise Exercise (stimulus) Lack of O2 (input) – picked up by receptor Sent to (control center) – increases heart rate to circulate blood faster (output) Increased heart rate (effector) As oxygen increases in muscle tissues (picked up by receptor), heart rate would return to normal. 5 POSITIVE FEEDBACK LOOP Ex: Labor Contractions Uterus stretches (stimulus) Nerve impulses (input) Hypothalamus (Control Center) Release of oxytocin (output) Uterus (effector) stretches more forcefully (response) 6 For review, work through Checkpoint Questions # 1-4, 6, 9-13 in textbook. *Don’t forget homework assignment! 7 ...
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