3.1 Hemeostasis in Living Things - Homeostasis in Human Body

3.1 Hemeostasis in Living Things 
■ Homeostasis is a process of regulating the internal environment(内部环境) of the body to be in a balanced and stable condition.
■ Homeostasis using corrective mechanisms(纠正机制).

Audio: Homeostasis using corrective mechanisms.



Homeostasis in Human Body
■ 70% of our body mass is water.
■  Every day, a large amount of water is lost from the body which needs to be replaced.
■  Excessive loss of water makes us feel thirsty and this can be fatal(致命) in the long term.
■  Our body temperature needs to be always maintained at 37°C
■  An extra 6°C rise in the body temperature can affect the functions of body cells and this can cause death.
■  Therefore, regulation of water content and body temperature are important homeostasis to sustain life(维持生命).

Regulation of Water Content
■ The systems involved in the regulation of water content are excretory system(排泄系统) and endocrine system(内分泌系统).
■ Regulation of water content in the body can be achieved by controlling the volume of
urine production from the kidneys(肾脏) using corrective mechanisms.

Audio: Increase in Water Level

Audio: Decrease in Water Level



Regulation of Body Temperature
■ The skin in the excretory system and hormone secreted by the endocrine system play an important role in regulating the body temperature.

Audio: Regulation of Body Temperature

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