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Describe parts of the neuron?
DENDRITE, SOMA, and AXON are the main parts of a neuron. Neurons signal one another via chemicals called NEUROTRANSMITTERS released at SYNAPSES. DENDRITES are usually the RECEIVING part, SOMA is the body of the neuron where the DNA is and most of the metabolic activity occurs, and AXON is the OUTPUT portion of the neuron. There can be many many DENDRITES, depending on the type of neuron, and the AXON can divide near its end and have some number of AXON TERMINALS. Neurons 'connect' at SYNAPSES (without exactly 'touching', that is without merging their cell membranes and sharing cytoplasm , and are held in place by SYNAPTIC ADHESION MOLECULES which protrude from each side of the synapse and stick to one another, binding the parts of the synapse together). A SYNAPSE is a tiny GAP between neuron structures (typically an AXON of one neuron and a DENDRITE of another), where the neural signal is conveyed from one neuron to the next via chemicals called NEUROTRANSMITTERS. A neuron signals another neuron in this way: as a neuron FIRES, an ACTION POTENTIAL is caused to move along the axon; when it reaches an AXON TERMINAL it causes tiny bags called VESICLES to merge with the cell membrane and release NEUROTRANSMITTERS into the SYNAPTIC gap (or CLEFT) between the neurons, where the neurotransmitters diffuse quickly to the post-synaptic DENDRITE. The dendrite has LIGAND-GATED ION PORES which have structures which receive the neurotransmitters, like a key into a lock, which then causes the pores to open and allow sodium ions into the dendrite. These sodium ions can then BEGIN this same process in that next neuron, if ENOUGH signals are received to TRIGGER its firing. A neuron can be TRIGGERED to FIRE if either MANY dendrites receive signals (called SPATIAL triggering), or if one or more dendrites receive many signals in quick succession (called TEMPORAL triggering).
Which type of cell is composed of one dendrite and one axon and is found in the eye and nose a. pseudo-unipolar neuron b. Schwann cell c. bipolar neuron d. multipolar neuron?
bipolar neuron
What does the structure of a neuron look like?
There are three types of Neurone and a different structure for each. Each of these types has all the same part just in a different arangement. They have a part callled the Axon which is where they send their Action Potentials (impulses) down, parts called Dendrites which is the heavily branched part where they receive stimulationfrom and a part inbwetween called the Cell Body which is where the Nucleus is. We will look at them in the order they would come in a complex reflex arc. Firstly the Sensory Neurone: This type of cell has dendrites that are out on a stalk from the cell body. These dendrited are specialised to activate neurone when a specific stimulation type is present. The axon from this cell type is usually not so long as in motot neurones but substantially longer than in interneurones. The cell body sits roughyl in the middle ot the two branches (the axon and the dendrite branches). Secondly the Interneurone: This types of cell are what is mostly found in the brain. They have incredibly branched dedrites making them look very like a tree. Their axons may or may not be branched and their length OS also very variable. Finally the Motor Neurone: Here the cell body and the dendrites are very close together, infact the dendrites brach directly of from the cell body. The axon in a cell of this type is usually very long and not very branched at all. This part will be connected to another neurone to pass the singal (in the form of an action potential) on to whatever organ is to be affecteed.
What type of cell is in your brain and is shaped to send signals?
Neurons are one type of brain cell that sends and receives signals. Neurons have three parts: 1. cell body - where the nucleus is 2. axon - extends from the neuron 3. dendrites-branches that extend from the far end of the axon I like to think of it as a cell with a long arm that has branches at the end. The long arm has insulation (myelin) around it that makes it conduct signals faster than a non myelinated cell. Take two neurons whose axons extend toward each other so the dendrites are close. When the electric wave sent from the first cell reaches the dendrites at the far end, the signal, in the form of a molecule with and electric charge, moves to where the dendrite of the other neuron can catch the signal and send it on. You need at least 2 neurons to transmit a signal: one to make the signal and the other to receive it.
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called?
Bipolar neurons have only one axon and one dendrite with the soma between them. There are probably very few, if any, neurons that contain only a single axon and dendrite. However, the concept is useful because some neurons behave as if they only had a single axon and dendrite. These neurons, called bipolar neurons because their cell body sits in between the axon and dendrite (giving the neuron two "poles"), are abundant in the nervous system. One very important type of bipolar neuron occurs in the retina, and is responsible for how we process light at an early level.
What type of neuron has many dendrites?
multipolar neuron
What is a type of neuron with only two dendrites?
The type of nearon with only two dendrites is bipolar.
Describe parts of the neuron?
DENDRITE, SOMA, and AXON are the main parts of a neuron. Neurons signal one another via chemicals called NEUROTRANSMITTERS released at SYNAPSES. DENDRITES are usually the RECEIVING part, SOMA is the body of the neuron where the DNA is and most of the metabolic activity occurs, and AXON is the OUTPUT portion of the neuron. There can be many many DENDRITES, depending on the type of neuron, and the AXON can divide near its end and have some number of AXON TERMINALS. Neurons 'connect' at SYNAPSES (without exactly 'touching', that is without merging their cell membranes and sharing cytoplasm , and are held in place by SYNAPTIC ADHESION MOLECULES which protrude from each side of the synapse and stick to one another, binding the parts of the synapse together). A SYNAPSE is a tiny GAP between neuron structures (typically an AXON of one neuron and a DENDRITE of another), where the neural signal is conveyed from one neuron to the next via chemicals called NEUROTRANSMITTERS. A neuron signals another neuron in this way: as a neuron FIRES, an ACTION POTENTIAL is caused to move along the axon; when it reaches an AXON TERMINAL it causes tiny bags called VESICLES to merge with the cell membrane and release NEUROTRANSMITTERS into the SYNAPTIC gap (or CLEFT) between the neurons, where the neurotransmitters diffuse quickly to the post-synaptic DENDRITE. The dendrite has LIGAND-GATED ION PORES which have structures which receive the neurotransmitters, like a key into a lock, which then causes the pores to open and allow sodium ions into the dendrite. These sodium ions can then BEGIN this same process in that next neuron, if ENOUGH signals are received to TRIGGER its firing. A neuron can be TRIGGERED to FIRE if either MANY dendrites receive signals (called SPATIAL triggering), or if one or more dendrites receive many signals in quick succession (called TEMPORAL triggering).
An action potential in the axon terminal of a motor neuron opens what type of ion channels?
Exocytosis
Which type of cell is composed of one dendrite and one axon and is found in the eye and nose a. pseudo-unipolar neuron b. Schwann cell c. bipolar neuron d. multipolar neuron?
bipolar neuron
What is the part of a neuron which acts as a tiny antennae and conducts signals toward the axon of that cell?
Type your answer here...
What is the relationship between a neurone and a nerve?
neuron = cell body + dendrites + axons nerve = axon + schwann cells (peripheral nervous system only) equivalent term of nerve in the central nervous system is called tracts neuron is a type of cell nerve is an anatomical term
The most type of neuron in the human body is?
Multipolar neurons This is the most common type of neuron, with one axon and many dendrites. Multipolar neurons are so-named because they have many (multi-) processes that extend from the cell body: lots of dendrites plus a single axon. Functionally, these neurons are either motor (conducting impulses that will cause activity such as the contraction of muscles) or association (conducting impulses and permitting 'communication' between neurons within the central nervous system).
What might a neuron have?
Neurons have lots of things. They have the usual cellular apparatus, a membrane, a nucleus, mitochondria, etc. They can also have some distinctive neuron type structures, which are axons and dendrites.
What is action portential?
The most common type of action potential is the change in voltage down the axon of a neuron. In other words, it is an electrical signal that is sent down the axon of a nerve cell.
Does impulse travel faster along myelinated neuron?
Yes, impulses travel faster in myelinated axon rather than in unmyelinated. It is mostly due to nodes of Ranvier. Instead of travel along the axon, in myelinated axon impulses "jump" from node to node. Also there are two types of myelinated axons: type A and type B. (Type C in unmyelinated axon.) Type A is the fastest among all of them.
What type of ion channels does an actions potential in the axon terminal of a motor neuron open?
voltage-gated calcium ion channel
