Name the four elements that make up the bulk of living matter

1 answer:

3 0

In living things, there are 6 common elements that can be found: carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus. Among these, the major ones are carbon, hydrogen, oxygen and nitrogen.

The most important of all that characterizes organic matter from the rest, is the presence of carbon. Carbon is a versatile element because it can bond to itself to an unlimited length. Because of this, it makes itself as host to other functionalities like hydroxide, amines and many more. The combination of a length of carbon chains with other of these major elements make up the basic compounds that our body needs. Compounds like carbohydrates, lipids, hormones, proteins and even our DNA and RNA strands are made up of these major elements.

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What valve prevents back flow into the left ventricle of the heart?

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Option D, aortic valve

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The location of aortic valve i.e between the aorta and left ventricle, allows it to stop the blood from flowing back into the left ventricle.

The other options are incorrect as -

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The tricuspid valve and mitral valve stops the blood from flowing back into the right atria and left atria respectively.

Hence, option D is correct.

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