conformers and regulators 2.4 Flashcards
(26 cards)
what effects an organisms ability to maintain its metabolic rate
external abiotic factors
what abiotic factors can wffect metabolic rate
pH
salinity
temp
the internal environment of a ________ is dependent on its external environment
conformer
how do conformers maintain their metabolic rate
behavioral responses
________ have low metabolic costs and narrow ecocofical niches
conformers
what allows conformers to tolerate variation in their external environment and maintain optimim metabolic rate
behavioral responses
what is homeostasus
the maintenence of steady conditions in an organism
________ maintain their internal environment regardless of the external environment
regulators
what do regulators use to maintain their internal environment
metabolism
do regulators have a wide or narrow range of ecological niches
wide
do regulators require lots or little energy to maintain homeostasus
lots meaning they have high metabolic costs
what is thermoregulation
the control of body temp by negative feedback
that is negative feedback
the control mechanism by which homeostasus is achived
what are the parts of negative feedback systems
monitoring centre
receptors
effectors
what is the temperature monitoring centre of mamals
hypothalamus
how is information communicated from the hypothalamus to the effectors
nerve impulses
what are corrective responses to a rise in body temp
sweating
vasodilation
hair erector muscles relax
decreased metabolic rate
how does sweating work to lower body temp
uses heat energy to evaporate water off the skin
how does vasodilation work to cool the body
dilates blood vessles near the skin so more heat is lost by radiation
how does lowering metabolic rate help to cool the body
less heat is produced
what are the corrective responses to a decrease in body temp
shivering
vasoconstriction
contraction of hair erector muscles
increased metabolic rate
how does shivering warm the body
involuntary muscle contractions generates heat
how deas vasoconstriction heat the body
lessens heat lost buy radiation through the skin
how does hair erector muscles contracting heat the body
traps hot air near the skin
