41 terms

Health 11 nervous system

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Main function of nervous system
Receives information about what's going on inside and outside your body and then processes the information and forms a response
Basic unit of the nervous system is a type of cell called
Neuron
Main function of a neuron
Carry messages or impulses from one part of the body to the other
Dendrites
Carry nerve impulses toward cell body
Cell body
Controls cells basic function. Contains nucleus.
Axon
Impulses travel along here toward other cells. Long fiber that carries the nerve impulses.
Myelin shealth
Helps increase speed of impulses
Synapse
Junction between axons. Connection between adjacent neurons.
Types of neurons
Sensory
Inter neurons
Motor neurons
Sensory
Info about internal and external environment collected by this type and sense organs. Nerve cell that carries impulses from a sense receptor to the brain or spinal cord.
Inter neurons
Located in the brain and spinal cord; pass impulses from one neuron to another
Motor neurons
Send nerve impulses to muscles and glands
Where is the central nervous system
Center of the body
Central nervous system includes..
Brain and spinal cord
Cerebrum
Specializes parts for movement, speech, abstract thought.
Cerebellum
Receives information from sensory organs, works with the cerebrum to coordinate movement and balance
Brain stem
Carries information to and from the rest of the body
Mid brain
Acts as a sort of relay station for auditory and visual information
Pons
Involved in controlling breathing
Medulla
Controls heart rate, blood pressure, swallowing, and other automatic functions.
Spinal cord
Thick column of nerve tissue that links the brain to most of the nerves in the peripheral nervous system
Reflexes
Automatic responses to the environment
In some reflex actions, the actions of the...
Skeletal muscles are controled by the spinal cord only: NOT BRAIN
Reflexes help..
Protect the body from harm because they enable you to react very quickly
3 parts of brain stem
Pons
Medulla
Mid brain
Peripheral nervous system
Network of nerves that link the rest of your body to your brain and spinal cord. Carries information to the central nervous system and then carries responses from the central nervous system to the rest of the body.
Sensory division
Some nerves carry information about your outside environment from your ears, eyes and other sense organs. Others carry information about internal body conditions such as blood pressure and heart rate.
Motor division
Somatic nervous system
Autonomic nervous system
Somatic nervous system
Motor nerves that carry signals that control voluntary actions
Autonomic nervous system
Motor nerves that regulate actions that happen automatically
Cerebrum, cerebellum, brain stem are parts of what part of the brain
Central nervous w
The brain is part of the
Central nervous system
Autonomic nervous system is part of
Peripheral nervous system
Spinal nerves are part of
Central nervous system
Spinal cord is part of
Central nervous system
Cranial nerves are part of
Central nervous system
Nerve
Bundle of axons
Sense receptor
The sense organ or cells that receive stimuli from within and outside the body
Neurotransmitter
The chemical secreted into the gap between neurons at a synapse
Nerve impulse
High speed signals that pass along the axon of nerve cells
Axon terminal
The structure at the end of an axon that produces neurotransmitters to transmit the nerve impulse across the synapse