metabolism in conformers and regulators 2.4 Flashcards
abiotic factors
temperature
salinity
PH
what is salinity
salt concentration
internal environment depends on its external environment
conformers
narrow range of ecological niches and low metabolic costs
conformers
conformers behavioural responses
bask in the sun to heat up
burrow to cool down
maintain constant internal environment conditions despite changes to their external environment
regulator
how do regulators maintain their internal environment
metabolism
high metabolic costs, large range of ecological niches
regulators
what is thermoregulation
control of body temperature
body temperature varies with the temperature of the external environment
thermoconformers
maintain a cnstant body temperature no matter the temperature of the external environment
thermoregulators
the maintenance of the bodys internal environment with tolerable limits regardless of changes in the external environment
physiological homeostasis
physiological homeostasis
the maintenance of the bodys internal environment within tolerable limits regardless of changes in the external environment
process of negative feedback
change in norm
change detected by receptors
message sent to efectrors bring corrective response
conditions back to norm
negative feedback defintion
and change away from the optimum is detected by receptors that switch on a corrective mechanisms to restore the conditions back to normal
corrective mechanisms is then switched off
unable to regulate body temperature
ectotherms
able to maintain body temperature
endotherms
bodys temperature monitoring centre
hypothalamus
central thermoreceptors
detects change in temperature of the blood, and bodys core
skin thermoreceptors
conveys information about the surface temperature of the body
how does the body deal with overheating
vasodilation
hair erector muscles contract
sweating
how does the body deal with overcooling
vasodilation
hair erector muscles contract
decrease in sweating
what is vasodilation
arterioles supplying the skin become dilated so a larger volume of blood flows through, heat is lost by radiating through skin
why do the hair erector muscles contract
to trap a layer of air on the surface of the skin to act as insulation
how does sweating cool the body
the energy from heat is used to change the sweat into water vapour by evaporation
how is information communicated from nerves to effectors
electrical impulses
why is thermo regulation needed
for optimal enzyme activity and high diffusion rates
