Summary

Summary Grade 12 Life Science notes on Homeostasis in the human Body

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Course
Life Sciences

Institution
12th Grade

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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Uploaded on September 8, 2022
Number of pages 13
Written in 2022/2023
Type Summary

glucose loop notes
carbon dioxide loop notes
water neg
negative feedback loop notes
blood glucose levels grade 12 notes
thyroxin negative feedback loop summaries
grade 12 life sciences homestasis note

Institution 12th Grade
Course Life Sciences
Schooljaar 200

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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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