KA4 Flashcards
(17 cards)
abiotic factors
temp, pH, salinity, seasons, water
conformers
organisms whose internal environment is directly affected by heir external environment. Make behavioral adaptations and have low metabolic rates
regulators
organism who can control their internal environment regardless of their external environment
homeostasis
maintenance of the body’s internal environment
negative feedback control
when body detects change in internal environment and finds a way to return it back to its normal state
hypothalamus
region of the brain which monitors and regulators temperature
thermoconformers
organisms which are unable to control their body temperature by psychological adaptations and dependent on external environments. Also known as ectotherms
thermoregulators
organisms which are able to maintain constant body temp regardless of external enviroments. Body heat prodcued by metabolism. Also known as endotherms
vasodilation
arterioles allow for large volumes of blood to pass through capillaries which are near skin surface. Heat then can be lost by radiation
skin overheating..
decreases metabolic rate and reduction of heat generated
hair erector muscles (overheating)
lowered as muscles are relaxed. This reduces layer of trapped air acting as a insulator
sweating
fluid secreted from eccrine glands. Evaporation of seat allows a cooling effect
vasoconstriction
arterioles allow only smaller volumes of blood to pass through capillaries with little heat energy lost by radiation
shivering
increase of temperature. Shiver expends more heat energy
hair erector muscles in overcooling
hairs raised due to muscles contracting. Layer of trapped air acts an insulator
skin overcooling..
increases metabolic rate and increase generation of heat
why is thermoregulation important?
for optimal enzyme activity and high diffusion rates to maintain metabolism
