2.4 Metabolism in Conformers & Regulators Flashcards
the ability of an organism to maintain is metabolic rate is affected by…
external abiotic factors
external abiotic factors (3)
- temperature
- salinity
- pH
conformers’ … is dependent upon the …
conformers’ internal environment is dependent upon the external environment
conformers use what to maintain their optimum metabolic rate?
behavioural responses
behavioural responses allow conformers to do what?
to tolerate variation in their external environment while maintaining optimum metabolic rate
conformers have … metabolic costs
low
conformers are restricted to a … ecological niche
narrow
why are conformers restricted to a narrow ecological niche?
because they are less adaptable to environmental change
regulators maintain … regardless of …
regulators maintain their internal environment regardless of external environment
regulators use what to maintain their internal environment?
metabolism
regulators have a … range of ecological niches
wide
why do regulators have a wide range of ecological niches?
because of their control over their internal environment
regulation of internal environment requires what?
energy to achieve homeostasis
regulators have … metabolic costs
high
hypothalamus
temperature monitoring centre of the brain
thermoregulation involves (3)
- hypothalamus
- nerves
- effectors
thermoregulation process (3)
- receptors detect change in body temp
- information communicated via electrical impulses through nerves to effectors
- effectors bring about corrective responses to return temp to normal
methods of decreasing body temperature (3)
- sweating
- vasodilation
- decreased metabolic rate
sweating
body heat is used to evaporate water in sweat, cooling skin
vasodilation
increased blood flow to skin increases heat loss
decreased metabolic rate
less heat is produced
methods of increasing body temperature (4)
- shivering
- vasoconstriction
- hair erector muscles contract
- increased metabolic rate
shivering
muscle contraction generates heat
vasoconstriction
decreased blood flow to skin decreases heat loss
hair erector muscles contract
traps a layer of insulating air
increased metabolic rate
more heat produced
the regulation of body temperature allows… (2)
- optimal enzyme activity
- high diffusion rates
- (these maintain metabolism)
