22 terms

Yr 9 Sc - Health 7-2 Nervous Control 2018

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Autonomic nervous system
the system controlling involuntary actions such as the heartbeat.
Axon
a nerve fibre that sends nerve impulses away from the cell body.
Brain stem
part of the brain where the spinal cord enters the skull. It controls the body's vital functions, such as breathing, blood pressure and heart rate.
Cell body
the part of the neuron that contains the nucleus.
Central nervous system (CNS)
the brain and the spinal cord.
Cerebrum
part of the brain that controls conscious thoughts, controls the movement of every body part, and receives sensory messages from each body part.
Dendrites
branches from the cell body that receive messages from other neurons.
Effectors
muscles or glands that put the messages into effect.
Medulla
the lower half of the brain stem.
Motor neurons
nerve cells that carry messages from the CNS to effectors.
Myelin sheath
the insulating layer that covers a neuron.
Nerve impulse
the electrical message carried by a nerve cell.
Neuron
a nerve cell.
Neurotransmitter
a chemical message released at the end of an axon to be received by the next neuron's dendrites.
Peripheral nervous system (PNS)
the nerves that carry messages to and from the central nervous system and other parts of the body.
Receptors
special cells that detect stimuli.
Reflex arc
sensory nerve, interneuron, motor nerve + connections to the brain.
Sensory neurons
nerve cells that carry messages from cells in the sense organs to the CNS.
Stimulus
any factor that stimulates a receptor and brings about a response.
Synapse
the space between two neurons.
Cerebellum
Controls coordination and balance
Inter-neuron
Nerve that links cells in the CNS