Homeostasis Flashcards
Homeostasis definition
Maintenance of equilibrium by active regulation and stable internal environment
Cardiovascular function
Body temperature
Food and energy regulation
Fluid regulation
What happens when body temperature is too high?
Receptors thermoreceptors send signals to control centre- and then the hypothalamus detects the deviation from set point and signals effector organs
Effector organs like skin blood vessels dilate and sweat glands secrete.
Body heat is lost to surroundings- temp drops down
What happens when body temp is too low?
Blood vessels sweat glands remain inactive
If body temperature continues to drop- control centre signals muscles to contract involuntarily and effector muscles generates body heat
Negative feedback mechanisms
Prevent sudden sever changes in body
Reduces action of effectors
Corrects set point
Limits chaos in body creating stability
Causing opposite of body disruption
Positive feedback mechanism
Produce more chaos in body
More instability in body
Uncommon loop
Increases actions in body positively
Examples: blood clotting and child birth
What are the major systems ?
Cardiovascular system - transportation
Digestive system
Respiratory system
Urinary system
Skeletal system
Muscular system
Integumentary system- protection, temperature regulation
Immune system
Nervous system
Endocrine system
Reproductive system
Examples of homeostasis
Body water regulation by osmoreceptors and kidneys
Temperature regulation
Blood glucose regulation
Maintain eye of ph, pco2 and po2
Constant supply of nutrients
Excretion of waste by kidneys
What is circadian rhythms ?
Daily cycles like body temp, heart rate, respiration, sleep
What is circannual rhythms ?
Yearly cycle like migration, mating, hibernation
Allostasis
Is when there’s efficient regulation requires needs and preparing to satisfy before they arise
