Human brain weighs 3 pounds.
Human brain does not feel any pain because there are no pain receptors in brain.
3. Percentage Of Fat:
Human brain is the fattest organ in the body, its contents are, at least, 60% fat.
4. Survival Without Oxygen:
Human brain can survive for 4 to 6 minutes without oxygen before it starts to die
5. Time before loss of consciousness:
Human brain gets 8 to 10 seconds before losing consciousness due to blood loss
6. Power generated by brain:
Human brain generates 10 to 23 watts of power when awake (that’s enough to turn on a light bulb!)
7. Part of oxygen and blood received by brain:
Human brain gets 20% of the total body oxygen and blood.
8. Total length of blood vessels in the brain:
Total length of blood vessels present in the human brain is 100,000 miles.
9. Number of synapses:
Human brain contains 1,000 to 10,000 synapses for each neuron.
10. Number of neurons:
Human brain contains 100 billion neurons.
Source : http://researchonmedical.com