chapter 1 study guide part 6
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13 Terms
What is homeostasis?
Maintaining a stable internal environment
How does aging affect homeostasis?
Becomes less efficient → higher risk of disease
What is the first step in a homeostatic control mechanism?
Stimulus – change in internal/external environment
What is a receptor?
Detects stimulus (e.g., thermoreceptors in skin)
What is the afferent pathway?
Sends info from receptor to control center
What is the control center / set point?
Compares info to normal range, decides response (e.g., hypothalamus)
What is the efferent pathway?
Sends instructions from control center to effector
What is an effector?
Organ/tissue that produces a response (e.g., sweat glands)
What is the response?
Change produced to restore balance (e.g., body cools down)
What is negative feedback?
Response reduces or opposes stimulus (most common)
Examples of negative feedback?
Body temp regulation, blood glucose regulation
What is positive feedback?
Response enhances or intensifies stimulus (less common)
Examples of positive feedback?
Blood clotting, labor contractions, lactation
Note 
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