1. Homeostasis

2. Homeostasis
Homeostasis is a process by which a constant internal environment is maintained despite changes in the external environment
The body maintains a steady state, through a series of monitored adjustments

3. Blood Sugar

5. Tolerance Ranges

6. Homeostatic Systems 3 Components: Monitor: special sensors
Coordinating centre: relays information to appropriate regulator
Regulator: helps restore normal balance

7. Example – Exercising

8. Feedback Systems
Negative Feedback vs. Positive Feedback

9. Negative Feedback
Process by which a mechanism is activated to restore conditions to their original state

10. Positive Feedback Process by which a small effect is amplified
Ex: the contractions in child birth caused by the release of oxytocin

12. Explain in your own words the concept of homeostasis
Differentiate between positive and negative feedback
Create a flow chart for the exercise activity

13. Homework
Research what the lower and upper limits are for 2 of the following and what happens to the body when we go outside the limits.
Body temperature
Blood sugar
Blood pH
Systolic blood pressure

14. Blood Sugar Lower Limits (Hypoglycemia) Fatigue Seizures
Unconsciousness
Brain damage
Higher Limits (Hyperglycemia)
Dehydration
Frequent urinating
Blurry vision

15. Body Temperature Higher Limits (40°C +) - Hyperthermia Headache
Confusion
Fatigue
Heat stroke
Dehydration
Lower Limits (35°C -) – Hypothermia
Blue lips, ears, fingers, toes
Physiological systems falter
Sluggish
Amnesia
Death

16. Blood Pressure High blood pressure (140/90) Damaged heart
Damaged blood vessels
Heart attack
Low blood pressure
Light headed
Dizzy
Faint
Chest pain or heart attack

17. Blood pH Low pH (Acidosis) Headache Diarhea Seizures
Increased heart rate
High pH (Alkalosis)
Muscular weakness
Muscle cramps and spasms
Tetany (involuntary contraction of muscles)