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The generation of a second action in some neurons can only happen after a refractory period, when the membrane potential has returned it's base level or even more negative. This is because some types of Na+ channels inactivate at a positive potential and then require a negative potential to reset. Other neurons have other types of channels and can fire multiple action potentials to a single depolarization.
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The events of a nerve impulse?
The electrical impulse in a nerve cell begins when ions move through the cells surface through ion channels.The nerve impulse.A nerve impulse is a wave of excitation that quickly travels within the surface of a neurone (nerve cell). This nerve impulse usually travels on certain parts of the nerve cell: on a dendrite or an axon. Within a neurone the first event depends on the type of 'nerve impulse'; there are two important types:1- nerve impulses generated at dendrites2- self propagating nerve impulses (action potentials) that travel along the axonNerve impulses generated at dendrites.Dendrites feed into the 'cell body' (soma) of a neurone. Nerve impulses that are generated in these dendrites travel toward the cell body.A sequence of events occur at the surface of a dendrite when the nerve impulse is sparked. The first event is transduction; this involves the transformation of one form of energy outside the dendrite into electrical energy within the dendrite.Nerve impulses that travel along axons.Nerve cells often have many dendrites but often only have a single axon. The essential difference between the two parts of the nerve cell is:- in dendrites electrical impulses travel TOWARDS the cell body of the neurone- in the axon the electrical impulses travel AWAY from the cell body of the neuroneThe nerve impulse that travels along an axon begins at the 'base of the axon', where the cell body and axon merge. This site is called the 'axon hillock' and is found to be the site where the first event in the formation of a nerve impulse actually occurs. Again, the first event is transduction at the axon hillock.Conclusion; the first event.For both of the cases above, and for virtually any other case, the nerve impulse begins with a process of transduction. The electrical nerve impulse begins once the first 'ions' leave or enter the nerve cell. Usually sodium ions enter, sometimes calcium ions are the firs to enter, sometimes potassium ions are the first to leave.
Write note on nerve impulse?
A nerve impulse is an electrical signal that travels along nerve cells, allowing for communication between different parts of the body. It is generated when there is a change in the voltage across the cell membrane, causing a wave of depolarization and repolarization to propagate down the length of the neuron. Nerve impulses play a crucial role in various bodily functions, including movement, sensation, and communication between the brain and other organs.
Is a nerve message also called a synapse?
Nerve messages are called an impulse. Synapses are the space between two axons.
Where does a nerve impulse start?
A nerve impulse typically starts at the dendrites of a neuron, where it receives signals from other neurons or sensory receptors. These signals are then transmitted down the axon of the neuron to the axon terminals, where they can communicate with other neurons or target cells.
Which of the following types of nerve fiber possesses the fastest speed of impulse propagation?
Myelinated A fibers have the fastest speed of impulse propagation among nerve fibers.
What is impulse in the nervous system?
electrical wave conducted along the nerve generated by the voltage difference across the cell membrane of the nerve cells.
How fast does a nerve impulse travels?
It 200 miles per hour And it can probally be in meters too.
How can a nerve impulse travel?
100 meters per second
Which membrane potential results in depolorization without a nerve impulse being generated?
excitatory postsynaptic potential
Which membrane potential results in depolarization without a nerve impulse being generated?
excitatory postsynaptic potential
Why can a nerve still be alive when a person is dead?
A nerve is simply a line of cells through which electrical impulses travel. These electrical impulses are generated by the movement of Sodium and potassium ions into and out of the cells which generates an action potential (impulse). Nerve cells can be stimulated once a person is dead if an electrical impulse is generated and so appear to be alive.
What is quicker a nerve impulse or a hormone?
nerve impulse
What is the path of a nerve impulse from your leg to your brain and back to your leg?
A nerve impulse travels from your leg to your brain through sensory neurons. Once in the brain, the impulse is processed, and a response is generated. The response travels back to your leg through motor neurons to initiate movement or action.
Is conducting stimulus strong enough to generate a nerve impulse?
Yes, a stimulus needs to reach a certain threshold level of strength in order to generate a nerve impulse. This threshold is required to depolarize the cell membrane and initiate the action potential. If the stimulus is not strong enough to reach this threshold, no nerve impulse will be generated.
Which travels quicker through the body a nerve impulse or a hormons?
a nerve impulse
What is the firing rate in a nerve?
The firing rate in a nerve refers to the frequency at which action potentials are generated and conducted along the nerve. This firing rate can vary depending on the type of nerve and the intensity of the stimulus being received.
How does a nerve impulse follow all or nothing principle?
How does a nerve impulse follow the all-or-nothing principle???
