4.6.1 Principles of Homeostasis

Question	Answer
What keeps conditions inside the body relatively constant?	Automatic control systems
Give examples of control systems	Cells called receptors - direct stimuli (changes in the environment) Coordination centres - receive and process information from receptors Effectors - bring about responses
What are the receptors in the eyes sensitive to?	Light
What are receptors in the ears sensitive to?	Sound Changes in positions (enable us to keep our balance)
What are receptors in the tongue and in the nose sensitive to?	Chemicals (enable us to taste and smell)
What are receptors in the skin sensitive to?	Touch Pressure Pain Temperature changes
What are receptors in the brain sensitive to?	Blood temperature Concentration of water in the blood
What are receptors in the pancreas sensitive to?	Concentration of glucose in the blood
Name some coordination centres	Brain Spinal Chord Pancreas
Many chemical process are coordinated by chemical substances called hormones. What are they secreted by and how are they transported?	Secreted by glands Transported to their target organs by the bloodstream
Name some internal body conditions that are controlled	Temperature Water content of the body Ion content of the body Blood glucose levels

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	Created by Anisha Rai over 9 years ago