summary for chapter 14 in Cambridge IGCSE® Biology Coursebook
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Course
IGCSE Biology
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IGCSE Biology
Book
Cambridge IGCSE Biology Coursebook with CD-ROM
Summary with all the important points in "Homeostasis" chapter to help you get all the points straight in your mind.
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IGCSE Biology Topic 1 (Characteristics & Classification of Living Organisms)
Class notes biology: Characteristics of living organisms
Class and mark scheme notes Biology Cambridge IGCSE with Biology Coursebook with CD-ROM
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Prompt sheet
14.1
Define homeostasis and its benefits
14.2
Define ectothermic and endothermic, there benefits and
drawbacks
The skin: epidermis and dermis
Draw the skin
Function of the hypothalamus
What will happen if there is general change in internal temperature
What will happen if the temperature decreased/ increased
What is negative feedback and how its related to constant glucose
concentration and temperature
14.3
Why the glucose concentration should be kept constant
How glucose is controlled in the body
When the glucose concentration decrease/increase
Define diabetes
Define type 1 diabetes, its causes, effects
What happen in Hyperglycaemia
What happen in Hypoglycaemia
Methods to test for glucose concentration in the blood and their
explanation
Things that might help type one diabetic person
, Homeostasis
14.1 maintaining internal environment
Homeostasis: the maintenance of constant internal environment
o In the tissue fluid surrounding the cells the temperature,
the amount of water and the glucose level are kept Note
constant Cells are surrounded
o Benefits : by a tissue fluid
Helps the cells to work as efficiently as possible
Helps enzymes to work at an optimum rate
Keeping constant amount of water means that the cells are not
damaged due to absorbing or losing water by osmosis
Keeping a constant glucose level means that there is always
energy for respiration
14.2 Control of body temperature
Endothermic
o The ability to maintain constant internal temperature, without
depending on the external environment
o Benefits :
Enzymes can work efficiently in any external temperature
Metabolism can still be going in any external temperature
They can still be active when ectothermic animals cant
o Drawback
Large amounts of food need to be ingested compared to
ectothermic animals
To generate energy for maintaining internal
temperature
Ectothermic
o Animals that are unable to maintain a constant temperature, hence
its affected by the external environment
o Ectothermic animals eat less food than endothermic, since they don’t
need energy to regulate there temperature
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