EXAM 1 Flashcards
What direction does heat flow?
Hot to cold
What molecules can cross membranes easily?
Non-polar, small stuff. polar is more difficult so small polar is possible
What is the difference between an endotherm and ectotherm?
endotherm, they regulate temp, ectotherm outside regulates them
What is a heterothermic organism?
An organism that is able to regulate its own body temperature
How do lungs display a structure/function relationship?
This is because as there is more surface area, there is more gas exchange, efficiency with more space to absorb
How does cholestrol affect membrane fluidity?
When it’s warmer, membrane maintains structure, colder wants to shrink and get close, increasing fluidity
How does insulation work?
There are several tools for insulation (fat, feathers, burn), so that in cold environments heat does not escape and in hot environments you lose it
What is behavioral thermoregulation?
physical activity for maintaining heat (mostly endotherms but some ectotherms), penguin huddling, human rubbing hands
if an animal has a low q10 in unpredictable conditions, what does this tell you about internal control?
a low q10, metabolic rate does not change that much for temperature, lower means less sensitive to environment, ectotherms generally have higher q10s and endotherms generally vice versa
What does an animal with a high/low q10 mean?
An animal with a high q10 has less control over their bodily temp and vice versa
Why are the terms “warm blooded” and “cold blooded” bad?
because some warm-blooded temperatures can have low temps and vice versa
How does vasodilation affect heat loss/retention?
If you vasodilate, you expand, losing more heat
What is vasodilation?
Vasodilation is the widening or relaxing of blood vessels, increasing blood flow and allowing for more oxygen and nutrients to be delivered to specific areas of the body.
How does lipid saturation affect membrane fluidity?
saturated means closer and less permeability and vice versa
How does vasoconstriction affect heat loss/retention?
when you’re cold how you retain heat, your cells shrink so you don’t lead blood flow to the surface
