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qaws [65]
3 years ago
13

What is the only crainial nerve that enters and leaves the skull?

Biology
2 answers:
Anestetic [448]3 years ago
6 0

Answer:

The correct answer is indeed the

accessory nerve

The fibers that make up the accessory nerve enter the skull through the foramen magnum and proceed to exit the jugular foramen with cranial nerves IX and X. Due to its unusual course, the accessory nerve is the only nerve that enters and exits the skull.

Pavel [41]3 years ago
3 0

Answer:

The answer is the accessory nerve.

Explanation:

We have 12 pairs of cranial nerves, the accessory nerve is the XI pair. This is responsible for the innervation of the sternocleidomastoid and trapezius muscles.

The fibers of the accessory nerve originate from neurons that are located in the upper spinal cord. These fibers join together forming roots and once the nerve is constituted, it enters the skull through the great hole that is located at the base of the skull.

Then, the nerve continues its path along the inside of the skull in the direction of the jugular hole and then leaves the skull next to the glossopharyngeal nerve (IX) and the vagus (X).

Thus, the accessory nerve enters and leaves the skull again, characterized by being the only cranial nerve which has this behavior.

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2 years ago
How is it possible that over 20 million living organisms on the planet are made up of only 5 types of nucleotide based arranged
almond37 [142]

Answer/Explanation:

The DNA in all living organisms is made up of 4 bases, adenine, thymine, guanine, cytosine. The RNA replaces thymine with uracil, making 5 types of nucleotide. The number of nucleotide pairs in a genome can range from half a million up to 100,000 million - meaning there are an exponential number of combinations of these 4 bases.

Imagine an organism exists that has only 2 nucleotides (<u><em>this is over 200,000x smaller than even the smallest bacterial genome</em></u>). If we allow any nucleotide at each of the 2 positions, then we have 4x4 (4²) or 16 possible combinations of sequences. For a nucleotide length of 4, the total number of possible combinations are 4⁴ or 256.

Since we are dealing with many millions of nucleotides, there are essentially infinite combinations of nucleotides, giving rise to the variation that produces over 20 million organisms on the planet.

3 0
3 years ago
Which process that occurs in living organisms is SIMILAR to the burning of fossil fuels?
Evgesh-ka [11]
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The burning of fossil fuels is known as combustion. It is often compared with cellular respiration.
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7 0
3 years ago
The ability of Salmonella to produce H2S is one characteristic that helps differentiate it from Shigella.
Goryan [66]

KIA tubes and SIM tube in this exercise to determine whether or not your unknown produced H2S.

<h3>What gas is produced by Salmonella?</h3>

F0F1 ATP synthase activity is necessary for Salmonella typhimurium to produce hydrogen sulfide and fermentative gases.

<h3>H2S production by Salmonella enterica?</h3>

Infections with Salmonella enterica continue to have a serious impact on global public health. H2S-negative Salmonella have lately surfaced, despite the fact that the capacity of S. enterica to produce H2S is an essential phenotypic trait utilized to screen and identify Salmonella with selective media.

<h3>H2S is it produced by Shigella?</h3>

Shigella do not create H2S, hence colonies on Hektoen agar appear bluish-green rather than having the black center seen with Salmonella. Shigella are comparatively biochemically inactive and do not ferment lactose or xylose.

learn more about Salmonella here

<u>brainly.com/question/14326716</u>

#SPJ4

the question you are looking for is

The ability of Salmonella to produce H2S is one characteristic that helps differentiate it from Shigella. List the three opportunities you had in this exercise to determine whether or not your unknown produced H2S.

KIA tubes and SIM tube

7 0
10 months ago
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bezimeni [28]

Answer:

True

Explanation:

that would be my best guess

6 0
3 years ago
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