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

Homeostasis

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)

Homeostasis as Room Temp1. Thermometer (receptor) notices higher

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

processes info3. Air conditioner (effector) turns on

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

Negative Feedback

Negative Feedback – Temp. Rises

Negative Feedback – Temp. Lowers

Negative Feedback

Positive Feedback

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

HomeworkChapter 1 Coloring Workbook

Number 10, 24 and 25 fromAn Introduction to Anatomy and Physiology –

Chapter 1Objectives 5-6