What does the plant hormone, or growth substnce, Auxin do?
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Card 7
Front
Compare the speeds of the nervous system in mammals, the endocrine system in mammals and tropisms in plants.
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Card 8
Front
What features do all neurones have in common?
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Card 9
Front
Most vertebrate neurones have a fatty insulating layer knwon as the myelin sheath. What benefit does this have?
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Card 10
Front
Because in a resting neurone, there are more Sodium ions outside the cell and more Potassium ions inside it, the inside of the cell is more negatively charged than its outside. What is this difference in charge known as?
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Card 11
Front
If the membrane of a neurone is stimulated, voltage dependent ion channels open, and Sodium ions from outside the cell flow in. What effect does this have?
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Card 12
Front
Straigh after an action potential has been formed, there is a short refractory period, in which a new action potential cannot be formed. How and why does this occur?
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Card 13
Front
What is the name given to the area at which two neurones meet?
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Card 14
Front
Explain the process by which a signal is transmitted across a synapse, upto the release of neurotransmitter into the synaptic cleft. 1) An action potential arrives...
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Card 15
Front
What happens once neurotransmitter has been released into the cleft?
