3. Temperature

module 3
week 3
BMR
SMR
RMR
AMR
DMR
Heat and its implications for physiology
Author
Affiliation

Marguerite Butler

School of Life Sciences, University of Hawaii

Published

September 10, 2024

Pre-class materials

Read ahead

Before class, you can prepare by reading the following materials:

  1. Withers chapter 5. Look over the homework, handout, and discussion questions and skim the chapter, reading anything that you need to know.
  2. [Discussion Questions]
  3. [Slide Deck] - for your reference as we go through the material

Announcements/Reminders

  • We are back in the lab this week. Read [Lab 3]. Watch the podcast on peripheral circulation. Read Do prelab quiz and the prelab, focusing on the hypotheses that you will design.
  • We will finish Metabolism and begin Temperature.
  • HW1 due Tuesday in class, hand-written (you may submit as a group - week 2 if you wish).
  • HW2 due next Tuesday in class (individual).

Week 3 Discussion Groups

Group Partner 1 Partner 2 Partner 3
1 Abby James Johsua
2 Veronica Ilan Kylee
3 Vivian Hao Mohamad
4 Adam Christian Sean
5 Ashton Tamako
Thought for the day

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.

Body Temperature

Q10

Iterative Method

For Next Time

  1. [HW2] due on Tuesday in class. (Individual)
  2. Finish temperature, begin [Cardiac Function]
  3. Start working on design 1 calculations with your partner. See me for help [Office hours]
  4. Next Lab: [Human ECG]
  5. Please fill out the TEAMMATES for both discussion week 3 and Lab 2 group lab by MONDAY. (check your email)