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2 years ago

Where are unmyelinated nerve fibers surrounded by schwann cells?

Biology

1 answer:

Ray Of Light [21]2 years ago

5 0

Answer: The myelinated nerve fibres are enveloped with Schwann cells, it form a myelin sheath around the axon.

Unmyelinated nerve fibres is enveloped by a Schwann cell that doesn't form a myelin sheath around the axon, and found in autonomous and the somatic neural systems. Sympathetic Nervous system is part of Autonomous Nervous system.

Explanation:

I'm Smart

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With the exception of the 12 cranial nerves, other major nerves exit the brain through the:

Oksana_A [137]

I think the answer should be medulla oblongata or foramen magnum.

The major nerves that leave brain should form a thick cord in the brain stem that called medulla oblongata. Medulla oblongata will pass a big hole in the base of the skull that called foramen magnum. Depends on what part the question asked(bone or tissue), it probably between those two options.

3 0

3 years ago

The half-life of carbon-14 is 5730 years. Radiocarbon dating can not be used to estimate the age of objects up to about 50,000 o

Nataly [62]

Answer:

False

Explanation:

it can be used to date stuff up to about 50000 years, so i'd say that its halfly false, so false is correct :)

7 0

3 years ago

After the centromeres separate during mitosis, the chromatids move toward opposite poles of the spindle and after cytokinesis be

Bond [772]

Hello there.

Regulation of the cell cycle is dependent upon cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)

c. cyclin A and Cdk2.

3 0

3 years ago

The highlighted structure separates the oocyte from the externally located ________. zona pellucida primary follicle corona radi

Naya [18.7K]

Answer:

Granulosa cells

Explanation:

Foliculogenesis is a dynamic and complex process through which the follicle goes through many stages of development in a short period (approximately 60 days in humans and some chimpanzees).

The stages classification is based on morphological changes such as follicular size or diameter, the number of follicular cell layers, etcetera. These classifications might vary among authors but could be denominated as:

Primordial follicle

Primary follicle

Secondary follicle and

De Graaf follicles (This is the one shown in the image)

Through each stage, there are certain modifications in the oocyte, follicular cells, and connective tissue. As the oocyte grows, the follicular cells might reach a size twice or three times bigger than the ones of the primordial follicles. Their shape also changes and they adopt an aspect of stratified epithelium. Their cytoplasm gets a granulous aspect, after what these cells receive the name of granulous cells. The De Graaf follicle characterizes for having a space named follicular antro that displaces the oocyte to one of the sides.

The oocyte at this point gets surrounded by zona pellucida and corona radiata .

The follicular antro (The highlighted structure) separates the oocyte from the externally located granulosa cells or follicular cells.

7 0

3 years ago

4.Paramecium is able to move by hairlike structures called ____

Rufina [12.5K]

Answer:

Cilia

Explanation:

3 0

3 years ago