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What connective tissue cover myelinated or unmyelinated axons?
The connective tissue that covers unmyelinated and myelinated axons is called endoneurium.
What region of the cell secretes neurotransmitters?
an axon terminal
Why node of ranvier is present on myelinated axon?
Nodes of ranvier are locations of bare cell membrane between segments of myelinated cell membrane. Ion channels responsible for repropagation of action potentials are concentrated at these nodes. Unmyelinated axons have ion channels all over their cell membranes since they do not have myelin segments.
Is and axon bulb and an axon hillock the same thing?
axon hillock = where cell body meets the axon axon bulb = end of the axon...lies very close to the dendrites of another neuron so impulses can pass over the synapse. AP Biology student *
What color are masses of myelinated nerve fibers?
Mylein is Fat, and is white. Answer #2 Myelin is actually a cell covering the "shaft" of a nerve axon, improving conduction across the cell as a whole. It doesn't hold stain as well, and generally appears whiter than unmyelinated cells, so they are white. Myelin isn't fat.
Do small unmyelinated axon travel signal faster than large unmyelinated axon?
no
Can a myelinated axon have a larger diameter than an unmyelinated axon?
Unmyelinated fibers typically have smaller diameters than myelinated fibers.
What type of conduction takes in unmyelinated axon?
continuous
How far would an action potential propagated in an unmyelinated axon?
The impulse will go to the terminal end of the axon. Other wise the very purpose of the innervation will be defeated.
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 is a disadvantage of unmyelinated nervous tissue when compared to myelinated tissue?
Unmyelinated tissue is substantially slower in conducting impulses along the axon. With myelinated axons, the action potential (impulse) jumps from node to node greatly increasing the speed of the impulse.
What is meant when axon is described as myelinated?
Most axons are covered with a protective sheath of myelin, a substance made of fats and protein, which insulates the axon. Myelinated axons conduct neuronal signals faster than do unmyelinated axons.
What generate and transmit nerve impulse?
A sensory stimulus can generate a neural impulse, as can repeated or multiple inputs of neural signals from other neurons.A neural signal is transmitted from one neuron to anotheracross a synapse via chemicals called neurotransmitters, and a neural impulse is transmitted along an axon of a neuron by either an action potential (in an unmyelinated axon) or by saltatory conduction (in a myelinated axon).
A myelinated nerve fiber is characterized as being whereas an unmyelinated?
Myelinated nerves are white, and composes the white matter of the brain and spinal cord they also are able to pass an action potential down an axon much faster; Unmyelinated nerves are gray, and composes the gray matter of the brain and spinal cord. These nerves transmit signals much slower
Why do humans possess a mixture of axons some large diameter heavily myelinated axons and some small diameter relatively unmyelinated axons?
The mixture of axon types contributes to variety of responses generated. Specifically, the rate with which a response is made can vary.
Gray matter in the spinal cord is mostly?
unmyelinated axons.
What connective tissue cover myelinated or unmyelinated axons?
The connective tissue that covers unmyelinated and myelinated axons is called endoneurium.
