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Likurg_2 [28]
3 years ago
8

Where does black line appear?

Biology
2 answers:
earnstyle [38]3 years ago
8 0
I don't think I can answer that cuz' I do not know what black line you're talking about

ddd [48]3 years ago
6 0
If you are asking about pregnancy, then in that case, this is also called Linea Nigra. One of the most common sign of pregnancy. It runs up the abdomen between the pubic area and bellybutton, or even higher. It is usually about .25-.5 inch wide, growing darker as the pregnancy advances. 

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3 years ago
Amino acids for- GACAAUGAAAGUUAGCAUGUGGUUGUGACGAAAG
trapecia [35]

Answer:

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Explanation:

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Which of the following elements is known as "nuclear ash" when it forms inside a star?
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2 years ago
2. Why is this change in global temperature a concern
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2 years ago
What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
Sliva [168]

Answer: The diffusion of ions along the axoplasm is faster,in myelinated compare to unmyelinated,

Neurons are the structural and functioning units of nervous system.They are the vehicles for transmission of impulses as electrical signals from one part of the cells,and from one part of the body to another.

The basic structural components of a typical neuron are the cellbody, the axon, and the dendrites.

Based on structure neurons are classified as myelinated and unmyelinated.This is based on the the surrounding layer of myelin sheath around the axon. The myelin provides the insulating layer for the axon.And ensures fast movement of impluses.

In myelinated neurons the myelin sheath are interrupted at intervals by gaps along the length of the axon called Nodes of Ranvier. These gaps contains more Na-K channels for influx and out-flux of K and Na+ ions for transmission of impulses.

The cytoplasm of axon is called axoplasm,Since this is surrounded by myelin sheath which contains Na-K+ channels,The rate of diffusion of ions along  these channels is faster for depolarization to take place than in unmyelinated neurons. Inaddtion as these ions  diffusion increases,its jump faster at the nodes of Ranvier (saltatory conduction) to the next axoplasm which further speed up the rate of transmission.

Unmyeinated lacks myelin sheath,therefore the exchange and  the rate of diffusion of ions along the axons is low.

Explnation:

6 0
3 years ago
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