The human nervous system Flashcards
The brain is one of the components of the nervous system
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The CNS coordinates the response of the effectors
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The effectors are muscles or glands that act in response to a change in the internal or external environment
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The spinal cord is the other component of the CNS as it is also important in coordinating the response of effectors in changes of environment
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The neurones carry electrical impulses between the receptors, central nervous system and the effectors
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The nervous system protects organisms from harm by responding to changes in the environment and it does this by coordinating communication of different parts of organisms
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Synapses are gaps between neurones and can be found at each junction of a reflex arc
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Neurotransmitters are chemicals that diffuse across synapses and bind to receptors on the next neurone
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A reflex action is an unconscious response that allows a human to respond to a dangerous situation automatically via the reflex arc
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The Components of the reflex arc are the Stimulus, Receptor, Neurones, Effector and response
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Neurotransmitters are chemical signals
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Nerve impulses need to travel across synapses
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The electrical impulse reaches the end of the neurone before the synapse which triggers the release of chemicals which are called neurotransmitters
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Neurotransmitters move down the concentration gradient across the synapse
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Neurotransmitters bind the next receptors on the next neurone
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