Main parts of the neuron Correct answers soma (cell body), axons (transmit info), dendrites (receive info) axon terimals (conduct messages)
Function of a neuron Correct answers Convey a message
The Dendrites Correc
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Main parts of the neuron Correct answers soma (cell body), axons (transmit info), dendrites (receive info) axon terimals (conduct messages)
Function of a neuron Correct answers Convey a message
The Dendrites Correct answers Branch like extensions of the cell body, allows neurons to connect to a large no of other neurons.
The cell body (soma) Correct answers Soma receives messages from other neurons through the dendrites
Soma has one other extension called the axon
Axon Correct answers When the stimulation reaches a point the axon hillock initiates an impulse that runs along the >>>>
fatty myelin sheath Correct answers Axons are enclosed in it
Insulates the axon
Separated by small gaps called nodes of Ranvier
Conducts impulse much faster
Impluse jumps from node to node
Axon terminal (telondendria) Correct answers Ends in a small node called Bouton terminal
Bouton terminal Correct answers Contains tiny containers called vesicles fill with neurotransmitters. Chemical substances that play a roll in conducting a message
Synapse cleft Correct answers The gap at the junction of the synapse.
Neurotransmitters Correct answers Regulate the communication between neurons
sensory neurons (afferent) Correct answers carry information from the senses to the brain
motor neurons (efferent) Correct answers Conduct messages from the spinal cord and the brain to the muscles and glades
Nerve tract Correct answers When the nerve is in the spinal cord or brain
Nerve Correct answers When the nerve is in parts of the body (excluding brain/spinal cord
Impulse conduction Correct answers process by which messages are relayed in neurons, from one neuron to the next
Electrical impulse Correct answers Begins in the first segment of the axon
Travels down the axon to the terminals because of electrical events at the cell membrane
Chemical impulse Correct answers determines if the impulse will be conducted across the gap
resting membrane potential Correct answers the electrical charge of a neuron when it is not active but polarised
Cell Membrane Correct answers contains a mechanism that allows some ions through and prohibits others
When a neuron is ready Correct answers + outside - inside
absolute refractory period Correct answers neuron doesnt respond to any stimulus
Axon cannot conduct an impulse
Refractory period Correct answers the membrane returns the soduim and potassium ions to the original states
pumps potassium inside/soduim outside
refractionary period Correct answers prevents the nervous systems from over stimulation
characteristics of impulse conduction Correct answers once impulse is initiated at the axon hillock it is rapidly conducted along the axon
it propagates down the axon from the axon hillock to the axon terminals
Nodes of ravier Correct answers these gaps separate the sheaths and contain the sodium and potassium ion channels required for impulse conduction
salutatory conduction Correct answers myelinated axon impulse conduction is known as
action potential conduction Correct answers unmyelinated axon impulse conduction is known as
Conduction Correct answers >>> of a nerve impulse in a neuron is primarily electrical
communication Correct answers between different neurons is primarily chemical
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