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2 years ago

Which two factors below make rapid and substantial blood loss life-threatening?

Biology

1 answer:

KIM [24]2 years ago

6 0

Answer:

The correct answer is: d. loss of blood pressure and loss of oxygen-carrying capacity.

Explanation:

Blood is a liquid connective tissue which is the major component responsible for transporting nutrients and oxygen to all the cells in the body and for removing carbon dioxide and metabolic wastes from all the cells of the body.
When there is excessive blood loss, the total volume of blood in the body decreases far below normal. As a result of this the blood pressure (pressure applied by the blood on the walls of the arteries) decreases.
This is because the rate at which blood is lost is far more than the rate at which it is produced.
The decrease in blood pressure prevents the blood from travelling easily against the gravity, hence it is unable to reach all the regions of the body, thereby depriving many cells of nutrients and oxygen. The waste products are also not efficiently collected from these cells. This causes the cells in the deprived regions to die.
Blood carries the most important component required for respiration and metabolism, that is oxygen, in association with haemoglobin molecules. Excessive blood loss causes loss of haemoglobin as well. This can cause reduction in the oxygen-carrying capacity of blood. Hence the cells of the body are unable to carry out metabolic activities properly due to the dearth of oxygen. This causes the death of cells.
Excessive death of cells causes tissues to become non-functional and that can cause organ failure. Multiple organ failure can pose severe threat to life.

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Periods of time when evolution took place quickly followed by long periods of stability

mihalych1998 [28]

Answer:

The theory of punctuated equilibrium states that evolutionary change is characterised by short periods of rapid evolution followed by longer periods of stasis in which no change occurs. ... To meet this challenge, evolutionary biologists attempt to describe how and why evolutionary changes accumulate over time

Explanation:

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2 years ago

A number of different types of mutations in the HBB gene can cause human β-thalassemia, a disease characterized by various level

Lubov Fominskaja [6]

Answer:

Mutations in introns create alternative splicing site which in turn make mRNA with reduced or no translation.

Explanation:

Introns regulate the splicing of heterogenous RNA during post transcriptional modifications as well as affect the stability of mature mRNA. The stable mRNA is more likely to be translated into proteins. So, introns also regulate the translation of mRNA.

In human beta thalassemia, mutations in intron create alternative splicing sites which in turn affect the formation of beta globin chain of hemoglobin. Lack of beta globin chain reduces the amount of functional hemoglobin and causes anemia.

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3 years ago

Why e-waste is a problem and present one possible way of mitigating the growing e-waste problem.

Ad libitum [116K]

Ewaste is a problem because it contains many hazardous chemicals like mercury, lead and cadmium which could seep in to the soil and eventually to the groundwater. This would lead to contamination of the drinking water. The most important thing to remember would be to separate this type of waste with the others. It would be better if you sell it or give it for reuse. Also, you can send it to a recycler that knows what to do with these wastes.

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3 years ago

Coral reefs are a vast community of individual organisms<br> true or false

aev [14]

Correct answer is True
Please mark as brainiest

6 0

3 years ago

Read 2 more answers

Scientists interested in the relationship among vision, foraging for food, and fitness studied three isolated populations of a s

Y_Kistochka [10]

a) Evolutionary fitness can be characterized as a person's commitment to the cutting edge's quality pool,which is chiefly founded on the aggregate or the genotype of the individual.This principally identifies with the conceptive achievement of an organic entity.

It is fundamentally determined by the offspring that can endure and pass on the characteristics/traits.

b) Graph is already uploaded in the below attached document.

c) The population 3 will have the most elevated frequency of heterozygotes,45% of the complete population.

d) Since population 2 is as of now having a low number of heterozygotes, the occasion would totally eliminate them from the population or decreases their number

Explanation:

Frequency of animals in population 1 having both alleles 1 and 3

frequency of allele 1 =0.60

frequency of allele 3= 0.25

Frequency of both allele 1 and 3 would be allele 1 + allele 3 frequency x 100

= 0.60+0.25 X 100= 85%

3 0

3 years ago