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Desember 06, 2009

HUMAN BRAIN

HUMAN BRAIN

All animals with a spinal brain. Whales are animals that have the largest brain, the brain weight of the whale for more than nine pounds (weight babies nine months). Elephant brain weight of five pounds, while the weight of the rat brain only a few grams.

Adult human brain weight almost half a kilogram. When compared with the whale's brain, we scrambled very small. However, when compared with the size of the human body, our brain is great.

The size of the brain showed no smart or dumb animal. This also applies to humans. Many men have heavier brains than female brains, but this does not mean that men are smarter.

Our brains fill in the front of our heads. Brain forms a soft, pink-gray to gray spongy wrinkled. More than three-quarters of the brain is made of water. Without the support of the skull that protects our brain, the brain will be like jelly.

The brain consists of three parts. Is a large part of the cerebrum, is divided into two parts formed as walnut. The cerebrum is the part to think. Big brain also allows us to move according to our desires, to solve problems and to remember.

Under a large brain, behind the head is a small brain. Small brain to make sure the muscles of our body works. The cerebellum also helps us maintain balance. Brainstem helps control how the machines in our bodies work. Among them, the cerebellum is responsible for the work of our breathing, heartbeat and digestion.

Composition of Neurology

There are three parts that control how the body works by sending signals to places in different parts of the body. The signal was walking along a small hair ties like threads called nerves.

Some signals straight to the brain through the spinal cord most of walking to the bonding into the neural spine. As our brains, three-quarters of our marrow is water.

Bones of the spine around the spinal cord. Spinal cord is protected by the spine, just as the brain is protected skull.

Brain and spinal cord form the central nervous system. Nerves that branch off in every part of the body formed around the nervous system, called periperal nervous.

More attached to nerve signals in our hands, what will we do? First our eyes send warning signals to our brain. Our brain immediately sends another signal back to our brain to the muscles move the hand of our hands. Our brains decide exactly how you should move your hands. This movement is called voluntary movement / accident.

Some movements, which happen very quickly without you thinking about moving first called reflexes. For example, if we touch a hot pan, with a flash of the hand signals we walked into our brains that says if a hot pot. Signal sent very quickly to the arm muscles which states that our hands away from the pot. We tendon reflexes also have motion. Try to test it. Sitting with legs crossed and let your friends beat us to our knees. We will be kicking leg. Sensor between hamstring and leg muscles to send a message to the spinal cord. The message comes and says that we should be straightened leg.

Big Muscles

Muscles that move the head, body and legs move us only if we want it. The muscles are called voluntary muscles. Muscles controlled by the cortex (cortex), outer layer of the cerebrum.

Unlike animals, humans have twisted the cortex folds in. If not folded, the cortex will cover a large area 30 times. The cortex is divided into several regions each of which receives and emits a different signal.

Controlled by voluntary muscles that cross the two parts of the brain, called the motor area. If we feel the mosquitoes stuck to our feet, our skin will send signals to a small part of the cortex. This area later to continue the information to the motor area, which then sends signals to the muscles of our legs are ordered to move the feet.

And how long did it happen?
It happened less than a time to blink.

Mind

The front of the brain used for thinking big. This area is usually called the mind. Every part of our brain do different thoughts. Usually the right used to feel and imagine. We use it when painting, writing, stories, or playing games.

Side is usually used to speak and to understand the conversation. Also used to solve the problem, for example for pocket money, or to create a model.

Have we imagine how the new foals born to uphold his legs so he could suck on its mother? Foal know what to do with instinct, without thinking.

When we are babies, our mind is empty. We know how to breathe and cry. All that is done by instinct. However, when we grow up, our minds begin to fill and more information about the world around us. We begin to learn and develop our minds, too.

How do we learn?
Like other parts of the body, our nervous system is made up of millions of tiny cells. These cells, called neurons. All neurons have a body. Every body has a tail or nerve fiber, which connects with other neurons, muscles or body parts. Some nerve fiber length is only a few millimeters. Others could stretch to more than one meter (from the spinal cord until our toes).

Each neuron also has branches that grow from the center. Nerve fiber from other neurons drawn into this branch. This means that each neuron is connected with thousands of other neurons.

As we begin to learn something, the signal through one neuron to another neuron, many times. Think again when we learn how to ride a bike. Remember how difficult it is when you first hold handlebar to keep it straight and keep our balance? However, with the exercise - after a walk through the neuronal signal several times until the incalculable - we can ride a bike with ease.

As we grow up and our knowledge increases, more of the mind is used. However, after age 25 years and over, some of our neurons begin to die and new neurons as penganti not grow. This is what causes why increasing age even more difficult to learn when compared with the children.

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