Organs respond to the external stimulus by a fraction of second. How do you feel about such controlling mechanism of the human body? (AS1)

The human body is equipped with most complex mechanisms without which survival is not possible. The human body is compatible to a great extent with various changes. Our body part, on receiving a stimulus react spontaneously.

Our body shows certain behavior on stimulating of sensory organs (receptor). As soon as our body senses a stimulus, a chemical signal is generated which travels down the neuron. The sensory nerve fibers bring sensory impulses from the central nervous system to the effector organs. The inner mechanism regarding the transmission of impulses is really interesting to know that the transmission is so quick that it takes the only fraction of second.