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alexandr402 [8]
3 years ago
13

The sequence of depositional units at a site is referred to as the siteʹs __________.

Biology
1 answer:
andrew-mc [135]3 years ago
7 0

The site is called Archaeological site. The type of artifacts and features found vary depending on the kind of site. The size of archaeological sites also varies.  Archaeological site is a place or location that contains evidence of past human activity. This evidence consists of artifacts and/or features. 

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What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
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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.

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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:

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