The five major organs that secrete digestive juices are the salivary glands, stomach, pancreas, liver and small intestine. Each of these organs synthesizes its mixture of digestive juices that breaks down food into smaller pieces that can be absorbed into the body.

Although you have more than 600 muscles in your body, there are only three types of muscle: smooth, cardiac and skeletal. Each muscle helps to keep you in motion, your heart beating or signal a natural response in your body, such as the ability to keep your eyes focused.

Preservatives are chemicals used to keep food fresh. Although there are a number of different types of food preservatives, antimicrobials, antioxidants, and products that slow the natural ripening process are some of the most common.

Intestinal parasites in the body are commonly caused by poor sanitation and hygiene, as well as international travel to locations where parasite infections are common. In some cases, worms may be spread through sexual intercourse when anal and oral sexual contact occur, according to Planned Parenthood.

Different body types are better suited to certain sports and physical activity. For example, the requirements of basketball tend to exclude extremely short players from advancing to the professional leagues.

Your cardiovascular system is made up of the heart, blood vessels and blood. It is a system that never rests. It pumps 5 to 6 liters of blood per minute through your body and can pump as many as 30 liters per minute during times of extreme stress.

Although a small amount of blood-tinged ear discharge might not be significant, it could be a sign of a potentially serious ear issue, especially in young children and those with a history of ear problems. If you notice even a tiny amount of bloody discharge from your child's ear, contact his pediatrician.

Simple squamous epithelium refers to a single layer of thin, flat cells that line body surfaces. One side of the surface opens to the environment while the other is anchored to the underlying cells.

When it comes to dental health, taking care of your fleshy, pink gums is every bit as important as brushing your pearly whites. Gum disease, also known as periodontal disease, is an inflammation of the tissue surrounding and supporting the teeth.

The wrist is one of the smaller joints in your body, but it is made up of multiple bones. Two rows of 4 small carpal bones sit at the base of your hand. The bottom row of carpal bones meets the end of the forearm bones, enabling movement in your wrist joint.

Your period, or menstrual bleeding, happens when your body sheds the lining of its uterus.

When your potassium and magnesium levels are too high or too low, complications can arise. Supplements may be appropriate if you are deficient in either mineral. Deficiencies should be closely monitored and corrected under the care of a health care professional.