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A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
refractory period. This is a brief time after a neuron has fired an action potential, during which it cannot generate another action potential in response to a new stimulus. This period is crucial for maintaining the directionality of signal transmission in the nervous system.
What is the sequence of events in a typical reflex arc?
receptor detects a stimulus - change in the environmentsensory neurone sends signal to relay neuronemotor neurone sends signal to effectoreffector produces a response
What 3 neurons make up a reflex arc?
There are actual two types of reflex arc. One contains just two and the other contains three.A reflex arc involves the following components:1. The receptor (sensory neuron) that detects a stimulus.The sensory neuron transmits the impulse to the spinal cord.2.The integration center (interneuron) in the cord. This one can be missing. If it is, the reflex is very, very rapid. If the interneuron is used, it can send information up the cord to the brain. Your response will be faster than your brain's "knowing" what happened.3. A motor neuron transmits a nerve impulse from the spinal cord to a peripheral region.An effector is a muscle or gland that receives the impulse form the motor neuron. In somatic reflexes, the effector is skeletal muscle. In autonomic (visceral) reflexes, the effector is smooth or cardiac muscle, or a gland.
How does a nerve impulse begin?
In order a nerve impulse to be generated there needs to be a stimulus. A stimulus would be you burning your finger or bumping your arm. Once the nerve impulse has been generated it sends off to the neurons in your brain so that your brain can tell you to move your hand.
What determine whether a neuron is unipolar bipolar multipolar?
The location of dendrite and axon: If dendrite and axon emerge from same process, the neuron is unipolar. If dendrite and a single axon emerge from opposite ends of the soma, the neuron is bipolar. If the neuron has more than 2 dendrite it is called multipolar.
What part of neuron carries and receives info?
The part of the neuron that receives the majority of inputs is the dendritic tree. In most neurons its appearance is very similar to what a tree would look like in Autumn with no leaves. The part that carries information away and toward the dendrites of other cells is called the axon. There is only one axon per neuron and they can vary quite considerably in their length.
A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
refractory period. This is a brief time after a neuron has fired an action potential, during which it cannot generate another action potential in response to a new stimulus. This period is crucial for maintaining the directionality of signal transmission in the nervous system.
How does the nervous tissue cause action?
The stimulus sends a signal to the sensory neurons, the sensory neuron brings it to the spinal cord or brain as the interneuron continues bringing the message. When it reaches the brain, the brain makes a decision, and sends it back down the spinal cord with the interneuron and passes the decision to a motor neuron. The motor neuron carries the decision to the designated muscle, and the muscle makes the move. Obviously all of this happens within a second. You wouldn't notice your reaction to the stimulus until it has happened since you react to stimulus very often. I'm sorry if this is a bit off topic, but I .
What is the sequence of events in a typical reflex arc?
receptor detects a stimulus - change in the environmentsensory neurone sends signal to relay neuronemotor neurone sends signal to effectoreffector produces a response
Does a synapse separates the axion end of one neuron to the dendrite end?
Yes, a synapse is the space (a VERY SMALL one!) between the axon of one neuron and the dendrites of the next neuron.
What are the very first of the three steps basic to all sensory systems?
1. Recieve stimulus 2. Transform stimulus 3. Deliver stimulus
What is the Spinal Reflex Arc?
A spinal reflex is an automatic, rapid response to a stimulus. The action is involuntary and occurs without any involvement of thought or the brain. In humans, this action occurs through a neural pathway called the reflex arc. To allow reflexes to occur very quickly, signals come directly from motor neurons in the spine, instead of being delayed by going through the brain.The arc works as follows:1. A receptor at the point of stimulus relays the message that there is an adverse stimulus to a sensory neuron2. The sensory neuron carries the message from the receptor at the point of the stimulus to the spinal cord (part of the central nervous system)3. In the spinal cord, a relay neuron, or inter-neuron, carries the message from the sensory neuron to a motor neuron4. The motor neuron then carries the message to the appropriate effector, at which point, the reflex occurs.After this spinal reflex occurs, sensory neurons send messages to the brain. The brain then relays this information and the messages are consciously interpreted. It is only at this point that you will begin to feel pain.Though this seems like a complicated process, spinal reflexes occur in under one second. Within that same second, the brain will consciously interpret the information and the person will feel pain.
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How strong is ultra soft?
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What cell is very long and has branches?
A nerve cell, or neuron, is long and branching.
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.
Why was it hard to stop pirates?
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