Homeostasis

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

Blood Sugar

Tolerance Ranges

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

Example – Exercising

Feedback Systems Negative Feedback vs. Positive Feedback

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

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

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

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

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

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

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

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)