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Relay neurons, also known as interneurons, are primarily found in the central nervous system, particularly within the spinal cord and brain. They serve to connect sensory neurons to motor neurons, facilitating communication between different parts of the nervous system. These neurons play a crucial role in processing and integrating sensory information and coordinating responses.
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Why doesn't the relay neurone have a myelin sheath?
Relay neurones, which are typically found in the central nervous system, often lack a myelin sheath because they are involved in processing and integrating information rather than transmitting signals over long distances. Myelin sheaths are primarily found on motor and sensory neurones, where rapid signal conduction is essential. The shorter axons of relay neurones allow for sufficient signal transmission speeds without the need for myelination, as their primary role is to connect and communicate with other neurones in close proximity.
What is the basic unit of structure and functon of the nervous system?
The nervous system is used to trasmit information around the body. It is made of two systems: the central nervous system (which consists of the spine and brain) and the peripheral nervous system (which consists of neurones and receptors). There are three types of neurones: sensory neurones, relay neurons, and motor neurones.
Type of neurones along a reflex arc?
the sensory receptor begins then the Relay neuron and final the motor neuron
How do you make a model of a nervous system?
You describe the different neurones (relay ect.) and how they work including any fine details.
What are bundles of neurones?
A nerve is a bundle of neurones
What type of neuron's involved in a knee jerk?
sensory neurones motor neurones
Why does the body have both sensory and motor neurones?
the body has both sensory and motor neurones because the sensory neurones sense what is happening and sends the message along and like a motor the motor neurones pass on the message constantly round and round until it reaches its destination
What are sensory neurones?
Neurons that receive info & send impulses to brian or spinal cord.
What is a bundle of neurones?
Synapse
Similarities of motor and sensory neurons?
Sensory neurones carry impulses to the CNS, motor neurones carry impulses to muscles.
How may you Explain the role of sensory and motor neurones in a reflex arc.?
what is the role of sensory and motor neurones in a reflex arc
What is the ascending nerve tract?
Nerve are bi-directional (they travel in both direction) as they carry both snesory and motor neurones (which are uni-directional). However the white matter (the part that carries the impulses) in the spinal chord can be split in two. The anterior part (front part) carries the descenging, motor neurones. These are better termed the Efferent neurones which means they are travelling away from the central nervous system (CNS). The posterior part (or back part) carries the ascending, sensory neurones. These are better termed Afferent neurones which means they are travelling towards the CNS. In short the "ascending" nerve tract is the part of the spinal chord that carries sensory neurones.
