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3 years ago

Explain why many vertebrates, including cows and domestic dogs and cats, have much better night vision than humans.

Medicine

1 answer:

rodikova [14]3 years ago

4 0

Answer:

The answer to this question has several factors, but probably the most important lies in the difference in eye structure and size of the different structures of the eyes, especially those specific for light detection and perception, and also, due to the difference in the amount of two types of cells in the eye, the Rods, and the Cones, which are responsible for light reception and color reception.

Most animals, especially nocturnal animals, or those who also have the ability to see at night and day, like cats, or dogs, have several factors that make them better at night vision than humans. The first factor is the structure of their eyes, and the organs that play a role in light perception. These structures are better developed, of bigger size, and capable of extracting light out of the lowest light densities, whereas the human eye is incapable of that, which is why human eyesight at night is poor. A second really important factor is the difference in the availability of one of the two types of eye cells, which are responsible for light and color perception: the Rods and the Cones. In these animals with nocturnal capability, the Rods are the most common, and thus, they can perceive more light, even when there is very little of it, from the environment. This is also why these animals cannot see in color at night, because they have less Cones, and more Rods.

Finally, there is also a small membrane in the eyes of certain animals, especially nocturnal onces, called the tapetum lucidum, which allows reflection of the light, and even further capturing of it.

These are all reasons why certain vertebrates are much better at night vision than humans.

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Criticism has been leveled at the curative rather than health promotion and disease prevention focus of the U.S. healthcare syst

Romashka [77]

Answer:

Yes, the focus should change to a disease prevention and health promotion plan.

Explanation:

The curative focus of the U.S healthcare system is an outlook that places more emphasis on the development of drugs and other treatment plans in the event of an ailment. This is not a proactive measure to counter health issues. It is rather reactive. The health promotion and disease prevention method focuses on countering and proactively dealing with situations that could lead to diseases. This is a better way of dealing with diseases for the following reasons;

1. It prevents the harmful side effects of drugs. A health-based plan that focuses on healthy ways of living like proper exercise and healthy eating would promote better health, and prevent the outbreak of diseases that would lead to the consumption of drugs with harmful side effects.

2. It saves cost. Evidence has shown that prevention is better than cure in terms of saving costs. Money that would have been spent on hospital bills and drugs are saved when healthy ways of living are observed. An example of this effect is the YMCA Diabetes Prevention program where people who are prone to diabetes are placed on a healthy lifestyle for a year. The result is that the likelihood of these participants suffering from type-2 diabetes is drastically reduced. This saves the cost that would have been involved in taking care of this disease.

3. It increases lifespan. The chances of people who stick to healthy ways of living rather than always subjecting themselves to drugs and other curative measures with their associated side effects are quite long.

For the above-stated reasons, it is imperative that the focus in the U.S health care system should change to the health promotion and disease prevention plan.

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3 years ago

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Answer:

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Explanation:

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2 years ago

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Answer:

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Explanation:

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3 years ago

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Answer:

Common causes of nausea after eating include food allergies, stress and pregnancy.

Explanation:

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2 years ago

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marusya05 [52]

One of the main medical reasons as to why one might avoid vaccination is that the individual may present allergies.

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Therefore, we can confirm that one of the only and main reasons to not get vaccinated is if your physician has instructed you to avoid the vaccine due to a possible severe allergic reaction.

To learn more:

brainly.com/question/25859287?referrer=searchResults

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