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An Efferent Neuron.
What are neurons that carry impulses from the brain or spinal cord to other organs and cause muscles to contract?
Nerves that only carry impulses away from the central nervous system (CNS) are called: Motor Nerves
The functional and structural unit of the nervous system for fast communication are called neurons. A neuron is made of cell body with extensions which are the axons and d…endrites that carry impulses.
Synapses. Net flow of charged ions ("impulses") in neuronal cells trigger additional ion flow (ionotropic signaling) or neurotransmitter release (metabotropic signaling)… to both neuronal and non-neuronal cell types ("the body") at junctions called synapses.
A neuron generates generates a nerve impulse at a region just off the cell body called the axon hillock. That nerve impulse travels away from the cell body down the length of …the axon by jumping from node to node in a process called saltatory conduction.
There are two ways in which an electrical impulse may be carried from one neuron to another. These junctions are called synapses. In a chemical synapse, the electrical impulse… arrives at the presynaptic membrane and this triggers the release of neurotransmitter molecules from vesicles out into the synaptic cleft (the space between the two neurons). An example of a very common neurotransmitter in the brain is glutamate. The neurotransmitter molecules bind to receptors on the postsynaptic membrane and can either directly open ion channels, or cause a chain of biochemical events that result in the opening of ion channels. In turn, the opening of ion channels in the postsynaptic membrane causes the voltage across the membrane to change and thus the electrical impulse proceeds down the postsynaptic neuron. Depending on the neurotransmitter and ion channels in the postsynaptic membrane, the first impulse could also inhibit the second neuron from propagating electrical impulses. The chemical synapse is much more common than the electrical synapse, described below. In an electrical synapse, the membranes of the two neurons are very close together and specific proteins form channels between them. This allows ions to move between the cells and the electrical impulse can thus move from one neuron to the next.
Nerve impulses are transmitted between neurons via neurotransmittors that are released into the synapse by the sending neuron. The neurotransmittor then binds to a receptor on… the receiving neuron; when enough receptors are triggered, an action potential is initiated on the receiving neuron.
Inter neurons or association neurons
These are called efferent neurons. The one that carry impulses away are afferent. Afferent (A) are away (A).