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Ray Of Light [21]
3 years ago
8

Describe how the schwann cells form the myelin sheath

Biology
1 answer:
sergey [27]3 years ago
5 0

Explanation:

The myelin sheath, lipoprotein structure deposited around axons selected in inner nodules, interrupted periodically by Ranvier nodules, allows saltatory, rapid and effective conduction in the nervous system of vertebrates. The cells that construct myelin are the oligodendrocyte in the nervous central nervous system (CNS) and the Schwann cells in the peripheral nervous system. An oligonucleotide myelinates one or more axons, while the Schwann always forms a single myelin internodule. The process of myelination begins when a cell-sheath projection involves the axon and a loose spiral shape around it. Over time the formed layers are compacted by the expulsion of the cytoplasm and the formation of a lamellar structure with thick electrodes bands - derived from the apposition of the cytoplasmic phases of the membranes - and fewer electrodes - derived of the external phases of the membranes.

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Explain why reintroducing wolves changed the ecosystem of the park? <br> WILL GIVE BRAINLIEST
Phantasy [73]

Answer:

because its a new place and the imvirontment isnt used to them

Explanation:

8 0
3 years ago
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Discuss the order in which seed dispersal mechanisms could have evolved
sladkih [1.3K]

The fossil records of primitive plants show a variety of seed dispersal mechanisms that has been adopted by plants at various stages and how they have evolved. The most primitive of this seed dispersal mechanism is the Anemochory

Anemochory is the dispersal of seed through the wind. The seeds have wing like structures and are lightweight to be able to fly away with the wind. They are dull colored and are pale that will prevent the seed from being visible.

Hydrochory is the next order of evolution of the seed dispersal mechanism which became majorly adopted by plants that tend to grow near water sources and those whose seeds are too heavy to fly in the air. One of the best examples is the coconut that falls off on the sea water in the coastal areas and floats to other lands and sprouts to a new plant.

Barochory is the dispersal of the seed through gravity. This is the mechanism where the fruit falls off to the ground due to gravity and grows into a new plant.

Endozochory is the dispersal of the seed through animals. In this case the seed is usually covered with a fleshy edible part which is consumed by the animals and in this process the seed goes into the digestive system of the animal and is excreted in a different place from where the seed can sprout into a new plant.

Ballochory is the dispersal of the seed due to the forceful ejection of the seed by explosive dehiscence of the seed. This lets the plant to place its seeds in a distant area. One of the best examples is the Hura Crepitans which is also called the dynamite tree, named after its exploding fruits.

6 0
3 years ago
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Theoretically, living organisms are capable of producing populations of infinite size. However, this never occurs because popula
yuradex [85]

Answer:

Biotic and Abiotic factors

Explanation:

Biotic factors such as predators can limit the population size.

Abiotic factors such as drought,torrential rainfalls,climate change,dessication etc.

4 0
3 years ago
A researcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. Assuming that none of the followin
densk [106]

Answer:

Option (B) is the correct answer of the following question.

Explanation:

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  • The first and most concentrated substance in the body is the collagen genes.
  • It is a large, indigestible cellular muscle which maintains organisms and gives internal cells a texture.
  • Collagen is also an essential part of the crisscrossing membrane neurons.

Other options are incorrect because they are not related to the given scenario.

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3 years ago
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__________, often caused by unsafe water and contaminated foods, leads to nearly 1 million childhood deaths each year. rubella s
Sveta_85 [38]
I think the correct answer would be diarrhea. It is often a result of consumption of contaminated food and drinks. And each year, it was estimated that approximately 2 million children died due to this. It is a condition where bowel movements are frequent and is in liquid form which would lead to dehydration.
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