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d3.3

homeostasis

TermDefinition
homeostasis internal environment between cells is regulated with variables as close to optimal as possible
EX of homeostasis blood glucose concentration, blood osmotic concentration, blood pH, core body temperature
feedback control uses information about outcome of process to make decisions about future of process
positive feedback increases gap between original and new level
negative feedback decreases gap between original and new level = original level restored = balance
islets of Langerhans small regions of endocrine tissue that secrete hormones directly into bloodstream
Alpha cell make and secrete glucagon if blood glucose goes below set point. stimulates breakdown of glycogen into glucose in liver cells and releases into blood = increase concentration
beta cell make and secrete insulin if blood glucose goes above set point. stimulates uptake of glucose by target cells in tissues.
diabetes condition where a person has consistently elevated blood glucose levels
thermoregulation control of core body temp to keep close to set point
EX of thermoregulation birds and mammals / 36C to 42C
hypothalamus center for thermoregulation. monitors body temperature through peripheral/central thermoreceptors + initiates response if hypothermia/hyperthermia
osmoregulation keeping osmotic conc of body fluids within narrow limits
osmotic concentration overall concentration of solutes in fluid that can affect movement of water via osmosis
excretion removal of toxic waste products of metabolism for the body
nephron tube with wall consisting of one layer of cells. last layer of cells that substances cross to leave the body
ultrafiltration first stage in production of urine. carried out by glomerulus in Bowman's capsule
Created by: user-1787887
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