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How many axons does each neuron have?
Most neurons contain one axon. There have never been more than one found. However, some neurons contain no axon at all.
When a neuron is depolarized to threshold?
1. The neuron fires an action potential, sending the electrical signal down the axon.
What does a neuron look like?
The parts of a generic neuron are:- soma - cell body axon - upto 1 meter long dendrite - many
What are the Parts of neuron?
1. The cell body (or soma) 2) The axon 3) The dendrites
Is it true that motor neurons pass messages from neuron to neuron?
Yes, an electrical signal is passed from the dendrites of 1 motor neuron, through it's cell body, through it's axon (the long tail looking feature of the neuron). It then travels through branches of the axon and forms synapses with other motor neurons, this is how the electrical signal is passed.
What are the 3 basic parts of neurons?
These are the basic parts of the neuron 1. the Dendrites (the nerve endings) 2. the axon (the body) 3. the Soma (the cell body) the axon is covered by the myelin sheath and like any other cell it has the nucleus
What part of a nerve cell is the longest?
Depends on the use and position of the neuron. But in most cases the axon is the longest part. From wikipedia: A typical neuron possesses a cell body (often called the soma), dendrites, and an axon. Dendrites are filaments that arise from the cell body, often extending for hundreds of micrometres and branching multiple times, giving rise to a complex "dendritic tree". An axon is a special cellular filament that arises from the cell body at a site called the axon hillock and travels for a distance, as far as 1 m in humans or even more in other species.
What is neuromusclular junction?
Connection between the motor neuron and the muscle fiber. Neuromuscular junction is made up of: 1. Axon ending of the motor neuron (contains the vessicles with acetylcholine ; neurotransmitter) 2. Motor end plate (portion of the sarcolemma that contacts the axon ending) 3. Synaptic cleft (space between the motor neuron and the motor end plate) Impulse--->axon ending--->release of ACH (acetycholine)--->ACH in the synaptic cleft--->ACH binds to the ACH receptors--->release of Calcium from sarcoplasmic reticulum--->Calcium activates Troponin and Tropomyosin--->binding sites are exposed.
How many general parts does a neuron have?
Broadly speaking, four parts: 'Dendrites' (1) which connect (although not physically) other neurons to the 'cell body' (2), which, if stimulated, will fire an action potential downs it 'axon' (3), causing the release of neurotransmitters from its 'axon terminal' (4).
What is the extensions on the distal end of a neuron called?
The distal end of a neuron is the axon, an extension that arises from the soma (cell body), and at the distal end of an axon there are extensions called telodendria. At the distal ends of telodendria are knoblike structures called synaptic end bulbs (sometimes called synaptic knobs). Synaptic end bulbs have synaptic vesicles inside them that contain neurotransmitters. Synaptic vesicles are released by exocytosis into the synaptic cleft for diffusion. I can't tell from the way your question is worded if you're asking about axons, telodenria or synaptic end bulbs because all of these structures are at the distal end of a neuron. Determine what the function of the "extensions" is and use whichever part of my answer applies.
What is the sequence of events in the process of synaptic transmission?
Neurons communicate with each other by sending electrical signals across a synapse. In a three neuron loop the series of events that happen in synaptic transmission are as follows: Neuron 1 sends an electrical signal (action potential) down its axon towards the synapse. The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 1 into the synaptic cleft. The neurotransmitters bind to the receptors of Neuron 2. This binding triggers a new action potential in Neuron 2 which travels down its axon. The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 2 into the synaptic cleft. The neurotransmitters bind to the receptors of Neuron 3. This binding triggers a new action potential in Neuron 3 which travels down its axon. The action potential causes the release of neurotransmitters (chemicals) from the terminal button of Neuron 3 into the synaptic cleft. The neurotransmitters bind to the receptors of Neuron 1 closing the loop.This series of events is repeated continuously allowing for the communication between neurons in a three neuron loop.
What are the five parts of a neuron?
The four major parts to the neuron are the dendrites, soma, axon hillock and terminal boutons.The dendrites receive input from other neurons, and integrate this information into the cell. They may result in either temporal or spatial summation which may result in depolarization of the cell.The soma, or cell body of the axon contains all of the organelles of the cell - the nucleus, mitochondria, etc. and is important for maintenance of the neuron.The axon hillock is the area of the cell with the highest number of ion channels present in the membrane, and also is the area of the cell that demarcates the start of the axon. From here, upon summation of stimuli, an action potential can be generated by the massive influx of ions into the cell, resulting in the generation of the action potential which is propagated through the axon.At the terminal bouton, this is where the action potential triggers a response. Using the neuromuscular junction as an example, when the action potential reaches the end of the terminal bouton, Ca2+ influx is triggered at the endplate resulting in the release of neurotransmitters, in this case, Acetylcholine, which causes contraction in the muscle.
