"Eat your vegetables!" It's a directive you've likely heard your whole life, since Mom served a side of broccoli with your meatloaf or mac-and-cheese.

Sight is a complex function of the brain that extends from the front to the back of the head. To produce sight, the eyes capture information and send it through the optic nerve to be processed by the occipital lobe.

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.

Ear pressure is commonly the result of fluid buildup in the middle ear, or pressure from an infection or allergic reaction, notes MayoClinic.com. Antihistamines are used to treat allergies and to reduce the amount of sinus mucus.

As the muscles tighten, pain from back spasm can suddenly bring your life to a halt. Spasms can be triggered by simple muscle overuse or more serious underlying issues.

Weird bodily noises are embarrassing, but they’re also natural and rarely a sign that anything is wrong. Your body is an incredibly efficient machine and, like all working things, it occasionally creaks and gurgles.

Urinary tract infections result when bacteria, such as Eschericia coli or the entrococci family of bacteria, get into the urinary tract. Urinary tract infections in males typically occur in older men, particularly men with prostate problems.

AIDS, or acquired immunodeficiency syndrome, is the potentially fatal disease caused by HIV, or human immunodeficiency virus. HIV causes severe damage to the immune system.

Reverse breathing -- also called Taoist breathing -- reverses the natural in-out movement of the stomach found in natural breathing. It occurs when the diaphragm is pulled into the chest during inhalation and drops down into the stomach on exhalation according to Yoga Journal.

Urine, like other body fluids, can be either acidic or alkaline. Acidic substances have a pH of less than 7 and alkaline substances have a higher pH. Urine normally is slightly acid, with a pH around 6, although it can range from 4.5 to 8.

The cells of the human body require a constant supply of oxygen to produce the energy necessary to accomplish their life-sustaining functions. Oxygen derived from the air is delivered via the bloodstream to the body organs and tissues.

Muscles are specialized tissues in your body that contain thousands of movable, elastic fibers. A particular type of muscle tissue, called skeletal muscle, is attached to bones throughout your body.