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Summary Grade 12 Life Science notes on Homeostasis in the human Body R99,00   Add to cart
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Summary Grade 12 Life Science notes on Homeostasis in the human Body
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This summary covers the definition of homeostasis and understanding the negative feedback loop (what it is and how it works). It also covers - Understand Homeostasis through the negative feedback mechanism that controls the levels of Thyroxin, Glucose, Carbon Dioxide, Water, and Salts. It also tou...

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  • September 8, 2022
  • 13
  • 2022/2023
  • Summary

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Homeostasis
Lesson Objectives:

Go through Homeostasis Definition

Understand Homeostasis through the negative feedback mechanism that
controls the levels of:

Thyroxin

Glucose

Carbon Dioxide

Water

Salts

Disorder caused by an imbalance in levels of:

Thyroxin - Goitre

Blood Glucose - Diabetes Mellitus


Homeostasis



📚 Homeostasis ~ the process of maintaining a constant, internal
environment within narrow limits, for optimal cell functioning despite
changes that take place internally and externally.




Homeostasis 1

, Within the actions of maintaining homeostasis, we look at only the negative feedback
loop, but you should know that there are 2 types of feedback loops:

1. The Positive feedback Loop
The positive feedback loop enhances or amplifies the change (or stimulus) this
tends to move a system away from its equilibrium state and make it more
unstable.


e.g:
stimulus - you pass a test
effect - you study really hard for the next one so you achieve the same, if not
better, results
response - you pass the next test
enhanced stimulus - you pass the next test by 5 percent more
effect - you continue to study hard etc….

2. The negative feedback loop
The negative feedback loop tends to decrease or buffer changes; this tends to
hold a system to some equilibrium state making it more stable (i.e., maintains
homeostasis)


What is a negative feedback loop?



Homeostasis 2

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