How are axons and dendrites alike?
Axons and dendrites both carry signals inside a neuron, and both signals are electrical signals. They are both extensions of the cell body. Thats about it.. In contrast, axons transmit action potentials whereas dendrites transmit graded potentials. Also, dendrites transmit signals towards the cell body whereas axons transmit signals away from the cell body.
How are neurons classified?
Neurons a classified by a. whether they catty impulsed dendrites to axons or axons to dendrites b. The amount of metabolic activity that takes place c. the number of dendrites that branch out d. their relative location and function in the body I'm stumped, i can't find anything in my notes or book about this. Help would REALLY be appreciated.
Neurons are classified by function and structure. If I was picky I would say just D is correct, motor, sensory and interneurons are their functions. Since it depends on more than just the number of dendrites I would say C is incorrect. A and B are just plain wrong.
Gray vs white matter?
In the spinal cord, what is the functional difference between gray matter and white matter? I know that axons in white matter are myelinated whereas in grey matter they are not, however I need to know about how they differ in function, not appearance. Does grey matter receive and send out signals, whereas white matter simply sends? Thank you for your response :)
Correct that the whte matter is primarily myelinated axons. The grey matter consists mostly of cell bodies, dendrites, and unmyelinated axons. So, the axons are efferent, conducting impulses away from the cell body; dendrites are the opposite.
Science Question help? Biology?
Hello, Okay I think I might have the answer to this question but I want to be sure. The question: Memories are actually the growth of what between neurons? I'm thinking its Dendrites. Thanks so much for the help:)
Axons, because we do have several head of axons growing during the creation of multiple associations to the same dendrite. They take several forms. Typically three are well recognised.
Clarification on Axons and Dendrites?
Hi, I was wondering if anybody could clarify the two for me. Does one receive and the other send, or vice versa or something totally different? The book I am reading is very laconic with the definition and it leaves me confused. Thanks for the help!
An axon or nerve fiber, is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma.
Dendrites are the branched projections of a neuron that act to conduct the electrical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.
So, in a neuron signals are conducted by:
dendrites - to the soma
axon - away from the soma
Are all axons myelinated?
Edit:one more question: The sensory neurons that are bringing impulses from outside the body, are their dendrites directly in contact with outside or skin or muscle or sense organs or what? and not another neuron?
No there are several kinds of axons. The main kinds are myelinated or unmyelinated but you can also get different classes of myelinated ones depending on how wide the axon is. An axon which is myelinated and is wide is fastest and an axon with no myelin and which is narrow is the slowest at conducting nerve impulses.
In relation to your second question the answer is yes and no. the dendrites are in the skin but synapse (interact) with one of several kinds of receptor eg a pressure sensor or machano-receptor. Hope this helps!