Homeostasis Homeostasis is a process by which a

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 p. H 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 • Confusion • 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 p. H Low p. H (Acidosis) • Headache • Diarhea • Seizures • Increased heart rate High p. H (Alkalosis) • Muscular weakness • Muscle cramps and spasms • Tetany (involuntary contraction of muscles)