Human Body: Facts about the Brain and Brain Tissue.

The human brain is the central system for the whole body. It's mass of about 108 billion neurons, they have multiple synapses that create a network of over 100 trillion connections tiny electrical currents and chemical messengers send information around the brain at 268 miles per hour. 

There's enough electrical current in your brain to power and LED light about 12 to 25 watts an adult brain weighs about 3 pounds. If you hold your fists together with your thumbs touching that's about the size of your brain. The folds in the brain increase its area of size a baby's brain is nearly smooth while an adult brain looks a lot like a walnut with lots of little folds brain.

Brain tissue needs both oxygen and glucose to function it uses 20% of the blood oxygen and glucose and brain cell begin to die. After 5 minutes of no oxygen different parts of the brain have different functions. The main structure in the brain is the frontal lobe and the parietal lobe. 

The occipital lobe the cerebellum the temporal lobe and the brainstem the brain connects to the rest of the body. Though the spinal cord which branches out into similar and smaller throughout the body. The nervous system is the body's wiring system. It transmits messages to and from the brain that is both voluntary and involuntary. 

The involuntary messages are things we can't control like a heartbeat feeling pain and reflexes voluntary messages are things we are aware of like reaching for a pen or speaking the pins and needles sensation happens. When the nerve is compressed. The single is disrupted injury to nerves can cause permanent paralysis and numbness nerve diseases.