the maintenance of a constant internal environment
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What does homeostasis keep the same?
Temperature, blood sugar levels, water levels, Waste products, Ions
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What is negative feedback?
the mechanism by which the body maintains conditions
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What temperature must the body be kept at?
37 degrees
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What occurs if its too hot?
Hyperthermia
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What occurs if it's too cold?
Hypothermia
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What happens when we are hot?
We sweat which evaporates and cools. Arterioles dilate bringing them closer to the surface where heat is lost through radiation. Hairs lie flat.
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What happens when we are cold?
We shiver so energy is produced in respiration. Arterioles constrict closing offf the blood suppy from the surface Hairs stand up trapping a layer of air.
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Where does Homeostasis take place?
Thermoregulatory centre in the brain.
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What happens if blood sugar levels get too high?
The pancreas secretes insulin
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What happens if blood sugar levels get too low?
The liver stops the pancreas secreting insulin and secretes glucagon
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What can too much sugar cause?
Diabetes
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What is water lost as?
sweat the air we breath and urine
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What does the central nervous system consist of?
brain, spinal chord and the sense organs
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What does a neurone consist of?
Cell body dendrites and an axon
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What is a synapse?
the junction between neurones
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What are the three types of neurone (say them in order of use)?
Sensory, relay and motor
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What stimuli do plants respond to?
Gravity, water and light
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What are the three types of tropism?
geo,hydro and photo
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Where are the auxins?
In the tips
20 of 20
Other cards in this set
Card 2
Front
What does homeostasis keep the same?
Back
Temperature, blood sugar levels, water levels, Waste products, Ions
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