One presynaptic neurone might diverge to several postsynaptic neurones. This allows signals to be transmitted to several parts of the nervous system, useful in a reflex arc.
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Card 7
Front
A membrane that has a potential difference across it. This is the resting potential.
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Card 8
Front
Carry the action potential from a sensory receptor to the central nervous system.
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Card 9
Front
The loss of polarisation across the membrane. It refers to the period when sodium ions are entering the cell making the inside less negative with respect to the outside.
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Card 10
Front
A change in the environment that causes a response.
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Card 11
Front
Carry an action potential from the central nervous system to an effector.
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Card 12
Front
It is achieved when the membrane is depolarised to a value of about +40mV. It is an all-or-nothing response. Only ever goes in one direction.
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Card 13
Front
Molecules that are released by endocrine glands directly into the blood. They act as messengers, carrying a signal from the endocrine gland to a specific target organ or tissue.
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Card 14
Front
The movement of ions along the neurone. The flow of ions is caused by an increase in concentration at one point, which causes diffusion away from the region of higher concentration.
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Card 15
Front
The hormone, released from the pancreas, that causes blood glucose levels to rise.
