1. Bio 104 So Far How Science Gets Done Arabidopsis as a Model Organism
To study growth and development under different environmental conditions (stimulus….response)
Adaptations to environments around the globe
Ecotypes and speciation process
Effects of genetic mutations **
Plant physiology **
Experimental design and the scientific method

2. So Far Cell metabolism and macromolecules
Dr. Moeller’s lectures: Origins and Diversity of Life on Earth
Environmental conditions over geologic time:
Temperature, oxygen, carbon dioxide, water, solar radiation
Changes conditions over time accompanied by changes in living things that were able to change rapidly enough through the process of natural selection
If changes are too rapid for organisms to adapt…... Extinction!

3. What’s Next?
Communicate results of our 6 experiments in scientific poster format
Work with Animals!
Humans, crocs, gators, turtles, and African Clawed Toads!
Physiology and behavior
Stimulus and response
Homeostasis of
Body temperature = thermoregulation
Reminder: testing ideas for use in Fall 2009 Bio 150 course with 225 students

4. Lab This Week: 1) Record and Analyze Electrocardiograms 2) Diagnose abnormal Electrocardigrams
Future Labs: Record electrocardiograms from crocs, gators, and turtles
The question: Do changes in environmental temperature or metabolism affect heart rate?

5. Homeostasis: The relative constancy of the internal environment
Steady state vs. equilibrium

6. Humans have ~200 cell types
The body: A society of interdependent cells, each type with its own needs and contributions.
01.01a.jpg
Humans have ~200 cell types

7. O2
List parameters
Steady state Vs
Equilibrium
SET POINT

8. Cell Membrane: selectively permeable
Invasive vs
Non-invasive
measurements
Cell Membrane: selectively permeable
Capillaries: highly permeable except to proteins

9. Homeostasis
Regulated via reflex arcs and naturally maintained by the process of negative feedback
Measurements
Which physiological variables?
Averages and ranges

10. Fig
Set points for some parameters have normal diurnal variations.
01.08.jpg

11. Thermoregulation

12. Physics of thermal energy flow
Cell metabolism= main source of heat in endotherms
(mammals, birds)

13. Conduction
Convection
Evaporation
Radiation

14. Mechanisms of thermoregulation For constant body temp heat in = heat out
Reflex arc
Negative feedback
Examples
Acclimatization vs. adaptation