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What are the components present inside our brain ?
The human brain controls the central nervous system by way of the cranial nerves and spinal cord, the peripheral nervous system and regulates virtually all human activity. The brain is made up of over 100 billion nerve cells with each brain cell connected to around 10,000 other cells, which equals around 1000 trillion connections in your brain.
The biggest part of the brain is the cerebrum which makes up 85% of the brain's weight. The cerebrum is the thinking part of the brain and it controls your voluntary muscles. The brain controls both involuntary, or "lower," actions, such as heart rate, respiration, and digestion. Complex, or "higher," mental activity, such as thought, reason, and abstraction, is consciously controlled. The human brain can be divided into three main parts: the forebrain, midbrain, and hindbrain:
 The forebrain includes the several lobes of the cerebral cortex that control higher functions.

 Midbrain functions include routing, selecting, mapping, and cataloguing information, including information perceived from the environment and information that is remembered and processed throughout the cerebral cortex.
An adult's brain requires around 20% of the body's oxygen. Approximately 20% of the blood flowing from the heart is pumped to the brain. The brain needs constant blood flow in order to keep up with the heavy metabolic demands of the neurons. The human brain weighs on average three pounds, or 1.5 kg.



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