Lecture 5 Flashcards
What is homeostasis
the state of steady internal physical and chemical conditions maintained by living systems
At water balance:
water gained = water lost
Osmosis:
molecules of solvent pass through a semipermeable membrane from a less concentrated solution into a more comcentrated one, equalizing the concentrations on each side
What are ways animals take in water
drinking, through skin, from food, produced by chemical reactions
What is rain harvesting
skin has channels, they do a body position in rain and collect water in channels, drink it through side of mouth
What do salamanders have to absorb water
costal grooves
What are ways animals lose water
evaporation, urine and feces and salt glands save water
Estivation:
dormancy-like state during hot and dry periods, characterized by inactivity and lowered metabolic rate
What are behavioural regulations to prevent water loss
- reduce surface area
- not active during day
- close eyes
- tuck limbs in, curl body
- cluster together
- burrowing
- active during rain events
Thermal equilibrium:
heat energy gained = heat energy lost
Ectothermy:
condition in which the external environment is the source of heat
Endothermy:
comdition in which heat is produced metabolically
Poikilothermy:
wide variation in Tb in response to environmental temps
Homeothermy:
constant Tb even with greater environmental temp fluctuations
Performance is _______
temp dependent
