18/02/2025
Negative FeedBack System Explain in easy way | FeedBack | 12th Class Biology Chapter 1 Homeostasis
Topic: Negative FeedBack System Explain in easy way
Watch now leacture 1:Homeostasis
https://youtu.be/oqdwsKgA2sg?si=rrYcBtWojlv0VN92
Watch now leacture 2: FeedBack System:
https://youtu.be/JxSqPtgh6wE?si=D4EQtuC2-PHgmr5p
Chapter:1
Homeostasis: Feedback
(1) Negatvie feedback
Defination:
A negative feedback mechanism is a biological or mechanical process that helps maintain stability (homeostasis) by reversing a change in a system. When a deviation from a set point occurs, the mechanism works to counteract that change and bring the system back to balance.
Examples of Negative Feedback Mechanisms
1. Body Temperature Regulation (Thermoregulation)
Stimulus: Body temperature rises above the normal range.
Response: The hypothalamus triggers sweating and vasodilation (widening of blood vessels), which helps cool the body down.
Result: The body temperature returns to normal.
(Similarly, when the body is too cold, the hypothalamus triggers shivering and vasoconstriction to generate heat.)
2. Blood Sugar Regulation (Glucose Homeostasis)
Stimulus: Blood sugar levels rise after eating.
Response: The pancreas releases insulin, which helps cells absorb glucose, lowering blood sugar levels.
Result: Blood sugar returns to normal.
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