Biology, 26.11.2019 23:31 thanks5640

Levels of total cholesterol and ldl cholesterol are directly related to the frequency of coronary heart disease. a) true b) false

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Answer from: oglilbrandon

a) true

Explanation:

Blood conducts cholesterol from the intestine or liver to the organs that need it and does so by binding to particles called lipoproteins. There are two types of lipoproteins:

Low density (LDL): they are responsible for transporting new cholesterol from the liver to all the cells of our body.

High density (HDL): collect unused cholesterol and return it to the liver for storage or excretion abroad through bile.

According to this interaction we can talk about two types of cholesterol:

Bad cholesterol: Cholesterol when attached to the LDL particle is deposited in the wall of the arteries and forms atheroma plaques.

Good cholesterol: Cholesterol when attached to the HDL particle transports excess cholesterol back to the liver for destruction.

- If their blood levels rise they produce hypercholesterolemia. It is shown that people with blood cholesterol levels of 240 have twice the risk of having a myocardial infarction than those with figures of 200.

- When the cells are unable to absorb all the cholesterol that circulates in the blood, the excess is deposited in the wall of the artery and contributes to its progressive narrowing causing atherosclerosis.

- If an atheromatosis patient keeps his blood cholesterol levels very low, he can get that cholesterol from the arterial wall back to the blood and be eliminated there. Therefore, patients who have suffered myocardial infarction or brain accident are recommended to maintain very low cholesterol levels to try to clean their arteries.

Hypercholesterolemia has no symptoms or physical signs, so its diagnosis can only be made by a blood test that determines cholesterol levels and also triglycerides. It is convenient that people at risk of having a dyslipidemia (alteration of the normal levels of these fats), who have relatives with ischemic heart disease and other cardiovascular diseases, undergo this test from an early age.

Answer from: Quest

c. movement because i took the test and it lets me review my answers

Answer from: Quest

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.

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