The BRAIN is an organ that serves as the center of the Nervous System in all animals,, only a few such as sponges,, jellyfish and starfish do not have a BRAIN.. It is located in the head,, usually close to the primary sensory organs for such senses like taste,, smell,, hearing etc.. The BRAIN is the most complex organ in the body or we can say one of the complex things in this universe.. In a typical human the Cerebral Cortex is the largest part of the BRAIN that contains 15–33 billion Neurons,, each connected by thin fibres called Synapses to several thousand other Neurons.. These Neurons communicate with one another by means of long fibres called Axons,, which carry signal pulses to distant parts of the BRAIN or body targeting specific recipient cells..

The function of the BRAIN is to exert centralized control over the other organs of the body.. The BRAIN acts on the rest of the body both by generating patterns of muscle activity and by driving the secretion of Harmon Chemicals.. This centralized control allows rapid and coordinated responses to changes in the environments.. Some basic types of responsiveness such as reflexes can be mediated by the spinal cord or peripheral ganglia,, but sophisticated purposeful control of behaviour based on complex sensory input requires the information integrating capabilities of a centralized BRAIN..

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