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After a nerve impulse, calcium ions are primarily found in the cytoplasm of the neuron. They enter the cell through voltage-gated calcium channels that open in response to the depolarization of the membrane. This influx of calcium ions plays a crucial role in neurotransmitter release at the synapse. Subsequently, calcium levels in the cytoplasm are regulated by pumps and buffers to restore baseline levels.
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What happens to a muscle when an electrical impulse from a nerve stops?
When the electrical impulse from a nerve stops, the muscle relaxes and returns to its resting state. This is because the nerve impulse initiates the release of calcium ions in the muscle cells, leading to muscle contraction. When the nerve impulse stops, the calcium ions are reabsorbed, causing the muscle to relax.
Which ion causes neurotransmitter vesicles to fuse with the axon's membrane during the conduction of a nerve impulse from one neuron to the next?
Calcium ions are responsible for triggering the fusion of neurotransmitter vesicles with the axon's membrane during the conduction of a nerve impulse. The influx of calcium ions into the neuron's terminal triggers the release of neurotransmitters into the synaptic cleft.
Do sodium ions move to inside of neuron in a nerve impulse?
No. Three sodium ions are pumped out of the neuron by the sodium-potassium pump and two potassium ions enter the cell. This way you maintain a slightly negative charge just inside the cell membrane.
What transfers the nerve impulse from one neuron to another cell at the synapse?
When the sodium ions that entered the cell through the ion channels diffuse into the axon terminal of the neuron, they activate voltage-gated calcium ion channels. As calcium ions flow into the cell, neurotransmitters are released from the cell. These neurotransmitters diffuse across the synapse and activate sodium ion channels in the post-synaptic cell, allowing sodium to flow in and depolarize the cell enough to start another action potential.
The chemically gated channel known as NMDA allows what ions entry into the nerve cell?
The NMDA channel allows calcium and sodium ions to enter the nerve cell in response to glutamate binding. These ions play key roles in neuronal excitability and synaptic plasticity.
What happens to a muscle when an electrical impulse from a nerve stops?
When the electrical impulse from a nerve stops, the muscle relaxes and returns to its resting state. This is because the nerve impulse initiates the release of calcium ions in the muscle cells, leading to muscle contraction. When the nerve impulse stops, the calcium ions are reabsorbed, causing the muscle to relax.
What two minerals are involved in nerve impulse and conduction?
Not minerals, it is ions. Calcium ions and sodium ions.
Which ion causes neurotransmitter vesicles to fuse with the axon's membrane during the conduction of a nerve impulse from one neuron to the next?
Calcium ions are responsible for triggering the fusion of neurotransmitter vesicles with the axon's membrane during the conduction of a nerve impulse. The influx of calcium ions into the neuron's terminal triggers the release of neurotransmitters into the synaptic cleft.
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.
How does the nerve impulse cause contraction of the muscle?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell. Depolarization triggers the release of calcium ions from the sarcoplasmic reticulum inside the muscle cell. In the presence of ATP, the high calcium level causes the myosin heads to bend, dragging actin filaments towards the middle of the unit of contraction.
Do sodium ions move to inside of neuron in a nerve impulse?
No. Three sodium ions are pumped out of the neuron by the sodium-potassium pump and two potassium ions enter the cell. This way you maintain a slightly negative charge just inside the cell membrane.
What are The electrically charged molecules that are involved in a nerve impulse are called?
The electrically charged molecules involved in a nerve impulse are called ions. Key ions include sodium (Na+), potassium (K+), calcium (Ca2+), and chloride (Cl-). During a nerve impulse, the movement of these ions across the neuron's membrane generates an action potential, allowing the signal to propagate along the nerve. This process is crucial for communication between neurons and the transmission of signals throughout the nervous system.
What transfers the nerve impulse from one neuron to another cell at the synapse?
When the sodium ions that entered the cell through the ion channels diffuse into the axon terminal of the neuron, they activate voltage-gated calcium ion channels. As calcium ions flow into the cell, neurotransmitters are released from the cell. These neurotransmitters diffuse across the synapse and activate sodium ion channels in the post-synaptic cell, allowing sodium to flow in and depolarize the cell enough to start another action potential.
What is one biological process that requires sodium ions?
Nerve impulse transmission requires sodium ions to help depolarize the cell membrane. When a nerve cell is stimulated, sodium channels open, allowing sodium ions to enter the cell and trigger an action potential.
When a nerve signals a muscle to contract where is calcium released?
Calcium is released from the sarcoplasmic reticulum inside the muscle cell when a nerve signal triggers the release of calcium ions. This calcium binds to troponin on the actin filaments, which activates the contraction process in the muscle cell.
What would a substance that decreases membrane premeability to sodium increase or decrease the probability of generating a nerve impulse?
A substance that decreases membrane permeability to sodium would decrease the probability of generating a nerve impulse. This is because sodium ions play a critical role in the depolarization phase of an action potential by entering the cell, so if their permeability is reduced, it hinders the ability to reach the threshold for generating an impulse.
What types ions are involved in the transmission of nerve impulse?
The transmission of nerve impulses primarily involves sodium (Na⁺) and potassium (K⁺) ions. When a nerve cell is stimulated, sodium channels open, allowing Na⁺ ions to flow into the cell, leading to depolarization. Subsequently, potassium channels open, allowing K⁺ ions to exit the cell, which helps restore the resting membrane potential through repolarization. This rapid exchange of ions is crucial for the propagation of action potentials along the nerve fiber.
