PNB 2250 Exam 2 Questions with Complete Solutions 100% Verified| Latest
Update Graded A+
ectotherm requires external heat sources to maintain core temp
normally small
spend less of day at optimal temp
less energy required to survive
mesotherm can use use metabolic heat to raise body temp above ambient but don't defend
core temp as well as endotherms
gigantotherm animal with low metabolic rate able to elevate core temp as a result of body
mass and increased capacity to maintain heat, but has so much water that it is hard to gain or
lose heat
basoendotherm endotherm with core temp less than 35
tuna core temp is above water temp because of an adaptation that allows them to swim
faster
TRP channels transient receptor potential channels
thermometers, open and close as a function of T
how animals detect temperature
in hypothalamus (thermostat)
is there a relationship to body size and core temp? no relation
,what is lethal temp? 6 degrees above core temp
how is core temp determined? genetically determined
what impacts core temp? tolerance (hardiness)- ability to endure difficult conditions
genetics
physiology
behavior
chaperone proteins help proteins fold and have the right shape
prevents denaturing
prevents misfolding
what is core temp detected by? calcium channels
heat gain is proportional to core temp
shivering contracting antagonistic muscles without putting in work to stay warm
fever increases survival, increase in core temp
pyrogens as a signal of infection
not a failure of temperature regulation
kappa heat transfer to the environment
affected by feathers, scales, skin thickness, environment, season, activity
, skin has high k
feathers has low k
peripheral vasodilation blood vessels carry heat from within and out to the surface, if blood
vessels are prevented from bringing blood to the surface, heat loss is decreased (decreases
kappa)
non colligative properties not dependent on the number of molecules in solution but on the
properties of the molecules, binds directly to ice crystals
glycoproteins prevent ice formation, 100x more effective than solutes
between liquid water and solid ice
make it hydrophobic so ice crystals cant form
where are nucleating agents? in exracellular space
does kappa change in winter and summer? no
thermogenesis brown adipose tissue; uncoupled oxidative phosphorylation
uncoupling proteins allow H+ movement without ATP production
FFA activated H+ transporter
allows us to generate heat
brown adipose tissue high number of mitochondria, generates heat
UCP expression
Update Graded A+
ectotherm requires external heat sources to maintain core temp
normally small
spend less of day at optimal temp
less energy required to survive
mesotherm can use use metabolic heat to raise body temp above ambient but don't defend
core temp as well as endotherms
gigantotherm animal with low metabolic rate able to elevate core temp as a result of body
mass and increased capacity to maintain heat, but has so much water that it is hard to gain or
lose heat
basoendotherm endotherm with core temp less than 35
tuna core temp is above water temp because of an adaptation that allows them to swim
faster
TRP channels transient receptor potential channels
thermometers, open and close as a function of T
how animals detect temperature
in hypothalamus (thermostat)
is there a relationship to body size and core temp? no relation
,what is lethal temp? 6 degrees above core temp
how is core temp determined? genetically determined
what impacts core temp? tolerance (hardiness)- ability to endure difficult conditions
genetics
physiology
behavior
chaperone proteins help proteins fold and have the right shape
prevents denaturing
prevents misfolding
what is core temp detected by? calcium channels
heat gain is proportional to core temp
shivering contracting antagonistic muscles without putting in work to stay warm
fever increases survival, increase in core temp
pyrogens as a signal of infection
not a failure of temperature regulation
kappa heat transfer to the environment
affected by feathers, scales, skin thickness, environment, season, activity
, skin has high k
feathers has low k
peripheral vasodilation blood vessels carry heat from within and out to the surface, if blood
vessels are prevented from bringing blood to the surface, heat loss is decreased (decreases
kappa)
non colligative properties not dependent on the number of molecules in solution but on the
properties of the molecules, binds directly to ice crystals
glycoproteins prevent ice formation, 100x more effective than solutes
between liquid water and solid ice
make it hydrophobic so ice crystals cant form
where are nucleating agents? in exracellular space
does kappa change in winter and summer? no
thermogenesis brown adipose tissue; uncoupled oxidative phosphorylation
uncoupling proteins allow H+ movement without ATP production
FFA activated H+ transporter
allows us to generate heat
brown adipose tissue high number of mitochondria, generates heat
UCP expression
