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Zepler [3.9K]
2 years ago
5

Astrocytes and tight junctions create a barrier to viruses and bacteria known as

Biology
1 answer:
Soloha48 [4]2 years ago
4 0
<span>Answer:The blood-brain barrier (BHE)

 BHE is a barrier that's highly permeability selective and protects the central nervous system  from potential dangers like viruses, bacteria and parasytes that may be circulating int he blood. <span>It is composed of endothelial cells, astrocytes, pericytes.</span></span>
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The word part telo- means "end." how does this word part relate to the meaning of the terms telomere and telophase?
strojnjashka [21]
For telophase it’s the end of mitosis and meiosis. And telomeres are basically caps at the end of your DNA to protect it.
6 0
2 years ago
Calculate how long it will take for one full base pair mutation to occur. Explain your reasoning with by constructing a mathemat
scoray [572]

Answer:

Since the gene mutates at a rate of 0.76 base pairs every 17.1 million years, to find out the time it would take for 1 base pair to mutate can be calculated by dividing 17.1 million years by 0.76

17,100,000 ÷ 0.76 = 22.5 million years

The following equation can be used to describe this:

μ = [(r2/N2) − (r1/N1)] × ln (N2/N1) = (f1 − f2) × ln (N2/N1)

r1 = the observed number of mutants at time point 1

r2 = the observed number of mutants at the next time point

N1 and N2 are the numbers of cells at time points 1 and 2

Hope that answers the question, have a great day!

5 0
2 years ago
Which of the following would not result in the dilation of the feeder arterioles and opening of the pre capillary sphincter in s
motikmotik

Answer:

Option (C).

Explanation:

The dilation of feeder arterioles carry blood directly into the blood vessels. The pre capillary sphincter in the systemic capillary beds can open due to the different factors.

The local release of histamines do not cause the dilation of feeder arterioles and does not cause the opening of systemic capillary beds. Histamine chemical is involved in the immune response of the body.

Thus, the correct answer is option (C).  

5 0
2 years ago
Match each scenario with the correct component of natural selection
Snowcat [4.5K]

Answer and Explanation:

On Average, sea turtles lay about 110 eggs in a clutch. However, only a fraction of the baby turtles make it to the ocean. Then, an even smaller number have offspring of their own - Overpopulation

While all zebras have stripes, no two zebras share the same stripe pattern -Variation

A lemur species called aye-ayes have very long, thin middle fingers that allow them to reach into holes in trees and dig out bugs to eat- Adaptation

6 0
2 years ago
Apakah peranan salur darah dalam meningkatkan kehilangan haba?​
charle [14.2K]

Answer:

Semasa suhu persekitaran adalah tinggi Dan panas Salur darah akan mengalami vasodilasi. Salur darah akan mengembang, serta menyebabkan lebih banyak darah mengalir dekat permukaan kulit. Oleh itu lebih banyak haba akan hilang

4 0
2 years ago
Read 2 more answers
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