3. Temperature
Pre-class materials
Before class, you can prepare by reading the following materials:
- Withers chapter 5. Look over the homework, handout, and discussion questions and skim the chapter, reading anything that you need to know.
- [Discussion Questions]
- [Slide Deck] - for your reference as we go through the material
Announcements/Reminders
- Monday is Labor Day. No class
Week 3 Discussion Groups
| Group | Partner 1 | Partner 2 | Partner 3 | |
|---|---|---|---|---|
| 1 | Justin | Morgan | Richard | |
| 2 | Adry | Matthew | Logan B | |
| 3 | Mayuka | Krystal | Logan M | |
| 4 | Anna | Garrett | Sasha | |
| 5 | Kirsten | Christina | Kylie | |
| 6 | Maisie | Alvin |
Physiology is the story of evolution’s struggle to maintain an appropriate SA/D ratio in relation to the volume of an animal – Haldane
3. Temperature
Modes of Heat Transfer
- Conduction
- Convection
- Evaporative
- Radiative
Animals also generate heat through Metabolism.
Flux = C * \(\nabla\) (Mass or Energy)
Q = C * M \(\nabla\) T
Where: - Flux is the transfer of mass or energy - \(\nabla\) is the gradient symbol - Q is heat - C is a material property (resistance or insulation value) - T is temperature
Heat Balance
Metbolic heat production is balanced by all mechanisms for heat exchange:
\(\Delta\)H\(_s\) = H\(_m\) \(\pm\) H\(_c\) \(\pm\) H\(_r\) \(\pm\) H\(_e\)
Where:
\(\Delta\)H\(_s\) = heat of storage
H\(_m\) = heat of metabolism
H\(_c\) = heat of conduction and convection
H\(_r\) = heat of radiation
H\(_e\) = heat of evaporation
If an animal is in heat balance, Tb (body temperature) is stable.
If \(\Delta\)H\(_s\) is positive, (Gains > Losses), then Tb increases.
If \(\Delta\)H\(_s\) is negative, (Gains < Losses), then Tb decreases.