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Homeostasis

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Page 1: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Homeostasis

Page 2: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

HomeostasisStable internal environment Involves

1. Receptor – senses stimulus2. Control Center – receives and processes info3. Effector – responds to stimulus4. Pathways

1. Afferent (receptor to control center)2. Efferent (control center to effector)

Page 3: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds
Page 4: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Homeostasis as Room Temp1. Thermometer (receptor) notices higher

room temp (stimulus)2. Thermostat (control center) receives and

processes info3. Air conditioner (effector) turns on

Page 5: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds
Page 6: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Homeostatic FeedbackNegative Feedback: a variation outside

normal limits triggers an automatic response that corrects the situationie: body temperature, hormone regulation,

blood pressure Positive Feedback: the initial stimulus

produces a response that reinforces that stimulus ie: clotting, birth contractions, lactation

Page 7: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Negative Feedback

Page 8: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Negative Feedback – Temp. Rises

Page 9: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Negative Feedback – Temp. Lowers

Page 10: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Negative Feedback

Page 11: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Positive Feedback

Page 12: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

Review Feedback with Whiteboards Define feedbackDefine negative feedbackDefine positive feedbackCompare and contrast negative and positive

feedbackWhich type of feedback is more commonList examples of negative feedbackList examples of positive feedbackDraw an example of feedback regarding

temperature

Page 13: Homeostasis Stable internal environment Involves 1. Receptor – senses stimulus 2. Control Center – receives and processes info 3. Effector – responds

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