OT Nerves Chapter 1 pg 5-6
basic cellular units of the nervous system
a cell which is specialized to carry an electrical signal known as a nerve impulse.
One of two major functional properties
Irritability – the ability to respond to a stimuli and convert it to a nerve impulse
One of two major functional properties Conductivity – the ability to transmit the impulse to other neurons, muscles or glands.
typical neuron is composed of dendrites, a cell body, and an axon.
dendrites carry the nerve impulse toward the cell body; the axon carries the nerve impulse away from the cell body
carry the nerve impulse toward the cell body; the axon carries the nerve impulse away from the cell body
the ability to transmit the impulse to other neurons, muscles or glands.
an electrical signal
is a respons to a stimuli and that is convert it to a nerve impulse
consist of chemicals acting as neurotransmitters, travel from one neuron to another at synapses.
the point of communication between two neurons.
Functionally, a neuron can be
sensory, integrative, or motor.
carries a sensory stimulus.
An integrative neuron integrates
sensory stimuli received from the sensory neurons.
A motor neuron
carries a message that directs a muscle to contract.
an insulating substance composed of lipids and proteins.
It conducts nerve signals.
The more an axon has, the faster its conduction rate.
protect support and nourish neurons,
maintain nerve homeostasis,
protect against infection and injury,
carried on the axon from the cell body to synaptic region.
across the neuron membrane becomes positive.
depolarize the axon membrane to a critical voltage, or threshold that opens sodium channels and generates an action potential.
• In unmyelinated axons, increased conduction velocity is achieved by increasing the diameter of the axon
spreads from the active to the inactive regions.
increased conduction velocity is achieved by increasing the diameter of the axon