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What would happen if a neuron was stimulated simultaneously at both ends?
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What would most likely happen to the action potential, if a neuron lost its myelin sheath?
The actional potential would not reach the axon terminals.
If electrically stimulated which portion of the brain would produce movements in the body?
The motor cortex of the brain would have to be stimulated in order to produce movement in the body.
Certain mental problems are thought to be caused by not having enough neurotransmitters. Why would a lack of neurotransmitters cause problems?
Neurotransmitters send signals from neuron to neuron
What type of neuron that interpretes message and sends out command?
That would be an interneuron otherwise known as an associative neuron.
What is a neuron and what are its structures?
A neuron is an excitable cell, which conveys an electric impulse when adequately stimulated. The structures are: the dendrites (inputs), the cell body (soma), the nucleus, the axon (the output, which can be thin and long up to a meter), with a Myelin sheath on the longer axons (made up of Schwann cells in the peripheral nervous system, or oligodendrocytes in the central nervous system, separated along the axon by the Nodes of Ranvier), axon terminal branches, ending with a terminal button which would form the beginning of a synapse when connecting to another neuron, or a motor end plate if connecting to a muscle cell.
If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon?
the impulse would spread bidirectionally
What is the main part of the of a neuron?
It depends on what you mean by 'main'. The AXON is the part which CONVEYS the neural impulse, which could be thought of as the main FUNCTION of the neuron. But the DENDRITES are the parts which assess whether the neuron has been stimulated enough to fire the axon, which is another fundamental function of some neurons. And the BODY (soma) of the neuron is very much a 'main' part of the neuron, because without it the neuron would die.
What would happen if a nerve fiber was stimulated from both ends simultaneously?
The neural activity progresses as if it were a wave (the effect moves but the nerve, of course does not). As the wave progresses it depolarizes the nerve surface, opens Na+ channels and activates the nerve surface as it goes forward. One effect of the firing however is that the Na+ channels inactivate and enter a refractory period in which they will not reopen. This essential drives the propagation wave in one direction only. If the nerve were to be simultaneously stimulated at both ends the two waves would meet and then activity would cease. Neither wave would be able to overcome the refractory membrane that the other wave had passed over.
What would happen if you dropped two rocks simultaneously on the moon?
they would hit the surface at the same time, same as on earth.
What would most likely happen to the action potential, if a neuron lost its myelin sheath?
The actional potential would not reach the axon terminals.
What would happen if the neuron did not have a myelin sheath?
if neurons didn't have myelin sheath then the transmission of nerve impulses is slowed or stopped
Where can a neuron be stimulated?
The cell membrane becomes more permeable to the sodium potassium ions.
What would happen to the resting membrane potential of a neuron if sodium were allowed to travel freely down its concentration gradient?
The cell will depolarise
What type of neuron would you expect to find at a neuromuscular junction?
Motor neuron
Why would a neuron not send an impulse?
If a neuron is not sending out an impulse or signal, this means the neuron is at rest. Neurons send signals electrochemically.
Why would a lack of neurotransmitters cause problems?
neurotransmitters send signals from neuron to neuron
If electrically stimulated which portion of the brain would produce movements in the body?
The motor cortex of the brain would have to be stimulated in order to produce movement in the body.
