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Friday, 11 October 2013

BIOLOGY 2013 FORECAST SERIES 3 - Homeostasis (Temperature)

Homeostasis, which is about the response of the body towards certain stimulus have been a favorite. We discuss the effect of warm temperature to the body for a start. Example of question:

Q: Discuss the role of effectors in regulating the body in warm environment.

The key point here is the effectors, so discuss about the effectors only, nothing more!

Diagram above is a typical human response in a warm climate. She is not horny, she's feeling hot -indeed she is! :-p. OK, let's forego our natural reproductive instinct and focus on the question...

First you need to know what is effectors, which are simply muscles & glands.

So, what the effectors for body response towards warm condition? They are 2 effectors involved, as shown below:

1. SWEAT GLANDS  (1mark)
- release sweat - cool down body when in evaporates. (1mark)

- undergo VASODILATION - blood vessels is ENLARGED - more blood goes to skin - heat is released via skin. (that's why skin becomes red!) (1mark)



There you go for the hot one. Later we go for the icy cold one...



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