Temperature regulation

Question 1

Why is temp regulation important?

Answer 1

enzymes and lipids are extremely sensitive and have ranges in which they function correctly

Question 2

What is a pokilotherm vs a homeotherm?

Answer 2

pokilotherm= body temp varies
homeotherm= body temp is stable

Question 3

What is an endotherm VS an ectotherm?

Answer 3

endotherm = primary source of body heat is metabolic
ectotherm = primary source of body heat is environmental

Question 4

feautures of endotherms?

Answer 4

• high metabolic rate
• greater environmental temp range
• high/stable body temp
• high metabolic rate + energy cost

Question 5

How are endotherms able to generate more metabolic heat?

Answer 5

heat is a byproduct of all metabolic activity and endotherms have leaker membranes. They need to maintain proton gradient and thus expend more energy above/below their thermal neutral zone

Question 6

Features of ectotherms?

Answer 6

• low metabolic rates and environmental temp determines body temp
• reduced expenditure of thermal regulation
• less food/energy
• limited activity
• reliance on environmental heat

Question 7

What is conduction, convection, radiation and evaporation?

Answer 7

conduction= transfer of thermal motion between objects in direct contact

convection = transfer of heat by movement of air or liquid past the surface

radiation = transfer of heat emitted by all objects

evaporation = removal of heat when liquid evaporates

Question 8

How do animals modify heat exchange?

Answer 8

• insulation
• heat windows
• panting
• sweating
• environmental water
• avoidance
• basking
• postural changes
• countercurrent heat exchange

Question 9

Describe how body temp, and size affect energy budgets?

Answer 9

• basal metabolic rate depends on size

- energy cost and unit weight and inversely related, smaller animals tend to have a higher metabolic rate