In the human body, health is maintained through the interconnectedness of organ systems, proper posture, and stable biochemical metabolism.
The "master gland" of the body, your pituitary gland -- located at the base of your brain -- secretes hormones that control the function of other glands throughout your body. It controls a range of physiological processes, including pubertal development and reproductive health, muscle growth and cellular metabolism.
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Bone growth begins early in fetal development -- at a gestational age of approximately 6 to 7 weeks, according to the University of Maryland Medical Center -- and continues throughout the rest of your life.
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Your immune system forms a barrier against infectious disease. Lymphocytes, a class of white blood cells, play a key role in recognizing and fighting harmful pathogens.
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