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Blood circulation in human body - What is the function of blood in the human body?

Blood is the fluid necessary for life.  It flows through the arteries, capillaries and veins of our body, and consists of a liquid part, called plasma, and blood cells that float in the plasma.
Adult body has about 6.5 liters of blood. The blood is the most perfect transfer system: it brings food and oxygen to each cell, and takes out the unnecessary products, delivers hormones and other substances, helps the body to fight infection and to adapt the body heat.
Types of Blood Cells There are three types of blood cells.
They are:  Red blood cells, which give the red color to the blood and carry oxygen,
White blood cells, of which there are several types and whose task is to fight infection, and finally,
the blood plates (Platelets) which help the blood to clot, thus preventing excessive bleeding and blood loss from injured blood vessel.All blood cells are created in the bone marrow.  If you look at the open bone, you will see in it reddish-gray cavity spongy substance. Under the microsc…

What are arteries, veins and capillaries - Human body for kids

Even in the most developed countries in the world, we can’t find a transport system, whose performance is comparable to the efficiency of the blood system in the human body.
Great “roads” and “highways” connect all kinds of big "cities", and food and other necessary supplies are delivered to them.
Such large pathways in the body are the arteries - vessels that carry blood from the heart and veins through which the blood returns to the heart. However, in the “small towns” and “villages” there is also need for food and supplies. Small roads and streets (the capillaries) reach to the villages and houses in the human body, even to the smallest stations.

Circulatory system (Source: Wikipedia)
What are Arteries? The arteries lie deep in the tissues, except in the area of the wrist, on the upper side of the foot, at the temples and on the sides of the neck.
From any of these places, we can feel the pulse, which is very important for the doctors.
Major arteries have valves at the plac…

Refraction of Light Experiment for Kids - What is Refraction?

When light passes from one substance to another, it may also change direction.
When light rays pass from air to water or from water to air, they bend as they pass through the surface of the water.
This bending is called refraction.
Refraction of Light Experiment: Can you bend a pencil? Can you bend a pencil without breaking it?
You can make a pencil look as if it has been bent, by putting it in water.

You will need:

a glasswatera pencil
1. Fill the glass halfway with water Put a pencil in the glass and lean it against the side.

2. Look at the water from the side The pencil will look bent.

3. Now take the pencil out of the water. Nothing has happened to it after all!

Light rays pass through other substances, as well as air and water.
They travel at different speeds as they pass through these substances.
As rays pass out of one substance and into another, they are refracted.
The amount that light is refracted depends on two things.
The first is the color of the light. 
Red light bends less …

Electrical Circuits for Kids - What is Electric Circuit?

Do you have a flashlight? Have you ever looked inside it? 
A flashlight won't light up unless there are batteries inside.
When you switch it on, the batteries make an electric current flow.
This current flows through the bulb and makes it light up.
When you switch on a flashlight, the batteries inside create an electric current by making electrons move. The electric current flows out of one end of the battery, through the bulb, and then back into the battery.
As long as the current can move freely around this pathway, the bulb will light up.
We call this kind of pathway an electric circuit. While the flashlight is switched on, the current continues to flow around and around the circuit. Turning the switch off makes a break in the circuit. Now the current can't flow, and the light goes out.
Electric Circuit experiment You will need:

two pieces of plastic-coated wire, about 8 inches (20 cm) long, with bare endsa screwdriver masking tape a 1.5-volt("D") batterya 1.5 volt …

Crystals for Kids - How do Crystals Form

If we look very closely at some grains of salt, we will see that each grain has the same shape.
Salt grains are shaped like tiny cubes.
Regular shapes like this are called crystals.
Many elements and compounds form crystals. The crystals in salt are easy to see. But other crystals are so small that you need to look through a microscope to see them.
Sugar and ice form crystals.

The atoms in different crystals join together to form different patterns. 
There are seven basic patterns of crystal.

The atoms of garnet form isometric crystals.

The atoms of quartz form rhombohedral crystals.

The atoms of zircon form tetragonal crystals.

The atoms of beryl form hexagonal crystals.

The atoms of topaz form orthorhombic crystals.

The atoms of gypsum form monoclinic crystals.

The atoms of feldspar form triclinic crystals.
Many rocks and metals in the earth's surface are found as crystals, too. The crystals of each element or compound are the same. Crystals are made when liquids cool or solutions…

Aluminum Manufacturing Process - How is Aluminium Produced?

Like many metals, aluminum is a very useful element.
It is found in rock as bauxite, which is an aluminum ore containing oxygen.
The oxygen has to be removed before the aluminum can be used.
The oxygen and the aluminum are joined so firmly that ordinary smelting does not remove the oxygen as it does with other metals.
The best way to separate the aluminum and the oxygen is to pass electricity through them.
This is called electrolysis.
First of all, rock and sandy particles are removed from the aluminum ore.
This leaves a white powder called aluminum oxide.
It is made up of aluminum atoms joined to oxygen atoms.
The powder is dissolved in a tank of chemicals and heated to about 1742 °F (950 °C).
This makes the aluminum oxide melt and become a liquid.
Molten aluminum collects at the bottom of the tank.
Any impurities in the aluminum collect at the top, where the aluminum oxide cools to form a crust.
Rods made of carbon are lowered into the molten aluminum oxide.
An electric current flow…