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Lean Body Mass
The total body weight minus the fat mass. Lean body mass consists of water, bones, collagen, and muscle.
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Life Expectancy
The average age at which 50 percent of newborn children survive.
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Limbic System
The part of the brain that is concerned with more primitive impulses and maintaining biological homeostasis.
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Longevity
The percentage of the maximum life span that an organism will reach before it dies.
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Luteinizing Hormone (LH)
The hormone released from the pituitary gland that stimulates the production of testosterone in males and the production of progesterone in females. This hormone uses cyclic AMP as its second messenger.
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