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timofeeve [1]
3 years ago
7

How does the respiratory center in the brain control breathing rate?

Biology
1 answer:
BaLLatris [955]3 years ago
4 0
The medulla oblongata detects the levels of oxygen and carbon dioxide concentrations and signals the muscles in the heart, the lungs and diaphragm to increase or decrease thebreathing. The pons controls the speed of inhalation and exhalation orrespiration rate depending on the need of the body.
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A scientist adds colchicine, a microtubule polymerization inhibitor, to a cell entering mitosis. At metaphase, the chromosomes o
defon

<u>Answer:</u>

<em>Colchicine is also known as mitotic poison. When it is added the separation of chromosomes of daughter cells are stopped. </em>

<u>Explanation:</u>

This is because the formation of spindle fiber is not allowed in the mitosis phase. Basically it is the process of arresting the mitosis at metaphase to study the chromosomes properly.

The addition of colchicine prevents the chromosomes to move to opposite poles. It makes the cell polyploidy. Hence the of addition of colchicine is the polyploidy of the cell.

7 0
3 years ago
Which organ of the digestive system does not directly contact food?
Softa [21]

pancreas

Explanation:

In addition to the GI tract, there are digestion accessory organs (salivary glands, pancreas, gallbladder, and liver) that play an integral role in digestion. The accessory organs do not come directly in contact with food or digestive content.

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3 years ago
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3 years ago
PCR is a useful technique because
Tpy6a [65]
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PCR is a useful technique because it is used to amplify small segments of DNA.

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6 0
3 years ago
In the phrase "survival of the fittest," the term "fittest" refers to:
nalin [4]

Answer:

A

Explanation:

From what I know this could be wrong, but in the four stages of natural selection, the first step is overproduction, the second step is adaptation, and the third step is competition or survival of the fittest. This means that only the organisms with the best adaptations for their surroundings will survive. COULD BE WRONG SORRY IF IT IS

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