Question

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please answer these three question,,,,,,,fast!!!!!!!!!!
i will mark u as brainliest,,,,,,,,,,please

⇒what happens if lymphatic system is absent in our body?
⇒guess why rainbow is formed semi circular on the sky??
⇒what are the functions of microvilli

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Answer 1

Hey mate here is the answer....

1 :Abnormal functioning of the lymphatic system is associated with Glandular fever, Hodgkin's disease, Oedema and Tonsillitis etc. Our body may also not be able to collect the excess fluid, cellular wastes, proteins, fats, and other substances too large to enter the blood capillaries and return them to the bloodstream.

2 :A rainbow is the diffraction of sunlight through water droplets in the air. To see a rainbow, you need to be looking at light rain with the sun behind you. The rainbow is curved as it reflects the round shape of the sun. It is a semicircle because only half of your field of vision is the air (the other half is the Earth). If you are in an aeroplane with the sun directly overhead and you look down into a raincloud, you will see the rainbow is a full circle, again reflecting the fact the sun is round.

3 :Cells may have slender extensions of the cell membrane to form cilia or the smaller extensions called microvilli. The microscopic microvilli effectively increase the surface area of the cell and are useful for absorption and secretion functions. A dramatic example is thehuman small intestine.

In the small intestine, these cells contain microvilli, which are tiny hair-like projections that increase nutrient absorption. These projections increase the surface area of the small intestine allowing more area for nutrients to be absorbed.


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Answer 2

Cells may have slender extensions of the cell membrane to formcilia or the smaller extensions called microvilli. The microscopic microvilli effectively increase the surface area of the cell and are useful for absorption and secretion functions. A dramatic example is the human small intestine. The tissue has small fingerlike extensions called villi which are collections of cells, and those cells have many microvilli to even further increase the available surface area for the digestion process. According to Audesirk & Audesirk, this can give an effective surface area of about 250 square meters for absorption.Microvilli (singular: microvillus) are microscopic cellular membrane protrusions that increase the surface area for diffusion and minimize any increase in volume,[1] and are involved in a wide variety of functions, including absorption, secretion, cellular adhesion, and mechanotransduction

The lymphaticsystem is anextensive drainagenetwork that helpskeep bodily fluid levels in balance anddefends the body against infections.

The lymphatic system is made up of anetwork of lymphatic vessels. These vesselscarry lymph - a clear, watery fluid containingprotein molecules, salts, glucose, urea, andother substances - throughout the body.

The spleen is located in the upper left part ofthe abdomen under the ribcage. It works aspart of the lymphatic system to protect thebody, clearing worn-out red blood cells andother foreign bodies from the bloodstream tohelp fight off infection.

Why They're Important

One of the lymphatic system's major jobs isto collect extra lymph fluid from body tissuesand return it to the blood. This process isimportant because water, proteins, and othersubstances are continuously leaking out oftiny blood capillaries into the surroundingbody tissues. If the lymphatic system didn'tdrain the excess fluid, it would build up in thebody's tissues and they would swell.

The lymphatic system also helps defend thebody against germs like viruses, bacteria,and fungi that can cause illnesses. Thosegerms are filtered out in the lymph nodes,which are small masses of tissue locatedalong the network of lymph vessels. Thenodes house lymphocytes, a type of whiteblood cell. Some of those lymphocytes makeantibodies, special proteins that fight offgerms and stop infections from spreading bytrapping disease-causing germs anddestroying them.

The spleen also helps the body fightinfection. The spleen contains lymphocytesand another kind of white blood cell calledmacrophages, which engulf and destroybacteria, dead tissue, and foreign matter andremove them from the blood passingthrough the spleen.
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Rainbows are a product of sunlight passing through small droplets of water suspended in the atmosphere (or even falling through it!). Not only are they beautiful, but they are usually rare because you need a rainy day and a sunny day at the same time to make one appear -- the sun has to be shining from one part of the sky, and the rain in another part of the sky before a rainbow can appear.

The sunlight takes a complicated path through each water droplet. It comes in the side closest to the sun, bends because the index of refraction in water is bigger than that of air (you can see this effect by putting a pencil in a glass of water so that some of it sticks out and looking at it from different angles -- the pencil will apppear "broken" at the place it crosses the water surface). The sunlight, passing through the water droplet, bounces off the back surface of the droplet, travels back to the other side, and bends once again on its way out.

The reason why the rainbow is curved is because all the angles in the water drop have to be just right for the drop to send some sunlight to you, standing on the ground. So, with the sun *behind* you, only those water droplets that have the same angle formed by you, the drop, and the sun (this angle happens to be approximately 42 degrees) will contribute to the rainbow. Other droplets send their light somewhere else, and if you move to a different location, new droplets are needed to make the rainbow you see in the new location. This is why you can't go to the end of a rainbow to find the mythical leprechauns and pots of gold; anywhere you stand, the rainbow is formed by faraway drops of water reflecting and bending sunlight. The rainbow is curved because the set of all the raindrops that have the right angle between you, the drop, and the sun lie on a cone pointing at the sun with you at one tip. The rainbow may look semicircular if the sun is setting or rising (a good time to see a rainbow because the sunlight at that time can get under rain clouds because it is traveling horizontally). If the sun is higher in the sky, the earth gets in the way and you may see less than a semicircular rainbow.