1. Homeostasis: Animal Form and Function

2. Learning Targets
I can apply the significance of surface area to volume ratio when explaining different animal internal exchange surfaces.
I can explain how interactions and coordination between organs and organ systems provide essential biological activities
I can describe both positive and negative feedback, provide one example of each kind, and explain which type of feedback helps to maintain homeostasis.
I can explain different homeostatic strategies for thermoregulation seen in animals.
I can explain what metabolic rate is and how it influenced by the following:
size of animal
energy budget of the animal

3. Positive and Negative Feedback: What is the difference?

4. Which type of feedback provides homeostasis?

5. Questions to condsider:

8. Surface area/volume ratio in action
lungs
Blood
Small intestine
Surface area/volume ratio in action

9. Metabolic waste products (nitrogenous waste)
Figure 40.4a
External
environment
CO2
Food O2
Mouth
Animal
body
Respiratory
system B l o d
Heart
Cells
Digestive
system
Interstitial
fluid
Nutrients
Circulatory
system
Figure 40.4 Internal exchange surfaces of complex animals.
Excretory
system
Anus
Unabsorbed
matter (feces)
Metabolic waste products
(nitrogenous waste)