How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from? Your brain is in charge of these things and a lot more. In fact, your brain is the boss of your body. It runs the show and controls just about everything you do, even when you're asleep.


The brain is the center of the human nervous system and is a highly complex organ. The human brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing, balance, taste, and smell. Brains control behavior either by activating muscles, or by causing secretion of chemicals such as hormones. It allowed you to extract information from the environment and acting in response to it. In vertebrates, the spinal cord by itself contains neural circuitry capable of generating reflex responses as well as simple movement such as swimming or walking. However, sophisticated control of behavior on the basis of complex sensory input requires the information-integrating capabilities of a centralized brain.

The Leader of Your Body

The human brain weighs between 3 to 3.5 pounds. Nearly 50 to 100 billion neurons create the brain and serve as its functional communication. These cells pass signals to each other via approximately 100 trillion synaptic connections. The brain’s high demand for oxygen and nutrients is reflected in its domination of the body’s percentage of blood supply at rest. The human brain requires nearly 20% of the blood supply while only creating about 2% of the total human body weight in an average adult. 750 milliliters of blood flow into your brain every minute, regardless of whether or not the body’s movement has altered, slowed, or hastened. When this blood flow demand goes unmet, your brain could shut down and make the body to lose consciousness.

The brain is created by the most delicate and sensitive tissue in the body. The metabolic rate of the brain is not only oxygen hungry, but requires constant nutrients in order to function as well as an ample waste removal system.

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