10.1 Principles of homeostasis Flashcards
Describe homeostasis - 3 marks
regulation of internal conditions of cell or organism
to maintain optimum functional conditions
in response to internal and external changes
What are receptors?
cells that detect changes in internal or external environment
may be part of nervous or hormonal control systems
What are coordination centres?
areas that receive and process information from receptors and
coordinate body’s response
may be part of nervous or hormonal control systems
What are effectors?
bring about response to signal from coordination centres
may be muscles or glands
Describe ways in which your external environment might vary? There are 5
Any three from: • temperature increase • temperature decrease • levels of sunlight increase • wind levels increase • lack of food
Explain how an increase in temperature affects your body?
warming body
Explain how an decrease in temperature affects your body?
cooling body
Explain how levels of sunlight increasing affects your body?
burning skin
Explain how wind levels increasing affects your body?
increasing cooling from skin surface
Explain how lack of food affects your body?
hunger.
Why is homeostasis important?
to maintain optimal conditions for enzyme action and all cell functions
What three things do homeostasis include in the human body?
- control of blood glucose concentrate
- body temperature
- water levels
The automatic control systems may include ……..
nervous or chemical responses
All control systems include … (3 things)
receptors
coordination centres
effectors
THe functioning of individual cells is vital for the way —————, —————– and —————— work
tissues
organs
and whole organisms
