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Based on his analysis of signaling , Cajal conceived of the brain as an organ constructed of specific , predictable circuits , unlike the prevailing view , which saw the brain as a diffuse nerve net in which every imaginable type of interaction occurred everywhere . This is because it is living tissue exposed to the environment and as the organ of vision , light is collected and concentrated on the retina . After building the clay model in my neuroanatomy course , I thought of the brain as an organ apart , one that functions in ways radically different from other parts of the body . Each employee who serves as an organ donor for the purpose of transplantation shall receive a leave of absence , with pay , of thirty days . The legislative department would be the first to feel its influence , and to cumulate authority , by encroachments ; since Congress , as the organ of the delegated powers , possesses , by an express provision of the constitution , all the discretionary powers of the government . Scientists have recently discovered that adipose tissue acts as an organ which secretes hormones that are important for regulating hunger and satiety , and energy utilization . " I knew , of course , that some modern whales have a pair of bones embedded in their tissues , each of which strengthens the pelvic wall and acts as an organ anchor .