BIOL 1003 Lecture Notes - Extracellular Fluid, Thyroid Hormones, Glycogen
14 Jan 2013
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Document Summary
Features that influence internal environment have a set level norm. Any changes from the norm is called deviation. Negative feedback / caused by deviation from norm / change results in return to norm. External environment is changing experienced by body: homeostatic system even out variations experienced by body. Liver can store or release glucose: blood is kept at a constant, ideal state. Glucose conc. of 80mg cm-3: tissue fluid surrounds working cell with constant ideal conditions. Negative feedback tends to restore systems to their. Factors in blood and tissue fluid must be kept constant: temp and ph. Humans maintain constant core body temp between 36-37. 8 c. Body temp refers to core body temp limbs may be cooler than 37 c: water potential / avoids osmotic problems cellular disruption, conc of ions (na, k, ca) Blood flows through receptors in the hypothalamus. Deviation causes the autonomic nervous system to initiate an appropriate response. Deficiency/drop in core body temp by decreasing heat.
