THE NERVOUS SYSTEM

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What is the Nervous system?
A system that allows the body to detect and respond to stimuli
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What form the CNS?
The brain and Spinal Chord
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What is the peripheral nervous system?
Nerves that connect the CNS to other organs
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How is stimuli detected by the sense organs?
Sense organs contain receptor cells that detect stimuli.Eyes,nose & tongue contain chemoreceptors
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What do receptor cells create?
Impulses
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Where does the impulses travel to?
Brain
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What does the Brain do to the impulses?
It proceeds the info and sends impulses to other parts of the body to cause a responnse
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What is the transmission of impulses called?
Neruotransmission
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Where doe Neurotransmission happen?
In the neurons
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What is the function of the sensory neuron?
Carry impulses from receptor cell towards CNS
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Describe the procedure of the impulse from the receptor cell to CNS?
A receptor cell impulse passes into the dendrites then is transmitted along dendrons and axons.Series of axon terminals alow impulse to be transmitted to other neuron
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What happens when the brain co-ordinates a response to stimuli?
Impulses are sent to Effectors and carry out action
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What do effectors include?
Muscles and Glands
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What is the function of the Motor Neuron?
Carries impulses to effectors
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What is the function of a Relay neuron?
Short, found in Spinal Chord where they link motor and sensory neuron
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What is a synapse?
Tiny gaps between neurons
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What is the procedure of impulse travelling in a synapse?
1-An impulse reaches an axon terminal 2-A neurotransmitter is released in the gap 3-This is detected by the next neuron which generates a new impulse
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What is the advantage of synapse slowing down neurotransmission?
Neurotransmitters are only released from axon terminals so impulse flow in one direction-Allows many fresh impulses to be generated so the original impulse is not lost
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What is the Reflex Arc?
Responses that are automatic and protect the body
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Why is the reflex path faster?
Because it bypasses the parts of the brain that involves processing the information
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What are the adaptation of dendron and axon?
Frequently long-which allow fast transmission over long distances
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What are the adaptation of Myelin Sheath?
-electrically insulates a neuron from neighbouring neurons,stopping the signal from being losing energy-Fatty layer-> Protects the electrical impulse and transmits signal quickly as it makes the impulse jump
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Why is it useful to have many axon terminals?
To communicate with lots of cells of the CNS
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Why is it useful to have many dendrites?
To pick signals from receptor organs
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Other cards in this set

Card 2

Front

What form the CNS?

Back

The brain and Spinal Chord

Card 3

Front

What is the peripheral nervous system?

Back

Preview of the front of card 3

Card 4

Front

How is stimuli detected by the sense organs?

Back

Preview of the front of card 4

Card 5

Front

What do receptor cells create?

Back

Preview of the front of card 5
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