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Maintaining a Healthy Internal Environment


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Homeostasis
How the body keeps internal conditions constant
37°C
The optimum temperature for the human body
Temperature and Water Concentration
What homeostasis usually keeps the same
External Environment
What can affect temperature and water concentration
Receptors
Detect change in the environment
Processing Centre
Receives information and coordinates a response
Effectors
Carries out a response
Negative Feedback
Ensures changes are reversed and returned back to the set level
Vasoconstriction
The blood vessels become smaller in response to low temperature
Vasodilation
The blood vessels become larger in response to high temperature
Kidneys
Maintains our body's concentration of water
Ammonia
In our urine; a higher concentration of ammonia means there is less water
Alcohol
Causes the kidneys to produce a greater amount of dilute urine (dehydration)
Ecstacy
Causes the kidneys to produce a smaller amount of dilute urine (polydipsia)
Antidiuretic Hormone (ADH)
The hormone controlling concentration of urine
Pituitary Gland
Monitors the concentration of the blood plasma