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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