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Plant and animals vary tremendously in their water requirements. Intake increases with size and, interestingly enough, in a mathematical way. Also of interest is the time required for a given member of a species to imbibe a quantity of water equal to its own weight. A mouse take 5 days; a cow, 2 weeks; a camel, 3 months; a tortoise, 1 year; a human being 1 month;and a cactus, 29 years.

Regardless of the amount of water taken in, however, the body normally balances the gain with an equivalent loss. Conversely, the body balances a loss with an equivalent gain. Either way, the central idea is balance. Humans possess phenomenal balance, in a 24 hour period a person's weight may vary less than 250 g.

The human body contains a dozen billion nerve cells (neurons) interwoven into what we call the brain and spinal cord. The basic unit of the nervous system is the  neuron, which consists of a cell body and branched extensions, or processes. Dendrites are those processes conducting nerve (electrical) impulses to the cell body, and axons are those processes conducting nerve impulses away from it. Sensory neurons conduct nerve impulses to or toward the central nervous system; motor neurons conduct nerve impulses to the muscles, glands, and organs; and connector neurons conduct impulses from sensory to motor neurons.

Whereas the sensory neuron typically has long dendrites and a short axon, the motor neuron has short dendrit and a long axon; connective neurons generally have short processes. The junction between the terminal endings of the axon of one neuron and the dendrites of another is referred to as a synapse.

The ear is divided into the outer, middle, and inner parts. The outer ear consists of the auricle and the auditory canal. The middle ear, a small chamber lying within the temporal bone and separated from the outer ear by the eardrum (tympanic membrane), houses the ossicles (three tiny bones bearing the names malleus, incus, and stapes) and communicates with the upper throat via the eustachian tube.

The inner ear consists of the outer osseous labyrinth enclosing the inner membranous labyrinth, whose parts are the cochle, semicircular canals, utricle, and saccule. A watery fluid, the perilymph, fills the space between the osseous and membranous labyrinths, and another watery fluid, the endolymph, fills the membranous labyrinth. The organ of Corti, the actual receptor of sound, is situated within the cochlea.