1. Regulatory mechanisms in animals

2. Animals respond to changes in their external and internal environments by adjusting physiological processes….
What is happening in these pictures???
Compare and contrast the structural, behavioural and physiological adaptations of the two animals

3. Homeostasis….. ….the maintenance of a constant internal environment……
Homeostasis is the maintenance of an internal environment
A negative feedback mechanism

4. Homeostasis is controlled by…
Homeostasis is controlled by…. the hormonal system…………………and the nervous system

5. What factors are under homeostatic control?
Body Temperature (Thermoregulation)
Water level in blood (Water balance)
Blood glucose concentration
Oxygen and carbon dioxide concentration in blood
Concentrations of ions ie sodium, chloride, calcium....

6. Activity 1. http://www.phys.unsw.edu.au/biosnippets/
Watch the first three sections of the link below
Represent as a diagram how you think the heart responds when
you have to run to catch the bus?
when you are resting on the bus?

7. The endocrine system
Compare and contrast the hormonal systems of the plant and an animal……….

8. The Nervous system A Neuron
There are two types of neurons: sensory and motor…..

9. Reflex arcs

10. Neural Pathways

11. How the nervous system works