Whole blood consists of 3 types of blood cells, suspended in a liquid called plasma. Blood circulates through the arteries and veins with each of the blood cell types -- red blood cells, white blood cells and platelets -- performing different functions throughout the body.

More than 30 million Americans have low bone mass, or osteopenia, according to the National Institute on Aging. Low bone mineral density can lead to osteoporosis, a condition in which the bones become fragile and are more likely to break.

While there are various types of muscles in the human body, when someone mentions muscle tightness, they’re usually talking about stiffness in the skeletal muscles.

Getting tripped up during a sporting event or simply losing your balance while strolling down a sidewalk can have painful consequences. Your knee may take the hit or twist and bend awkwardly during a fall.

When attempting to gain muscle and improve your body composition, there are many types of workout programs you can use. One potential muscle-strengthening method is to train just one body part a day.

Gluteus maximus, the largest muscle in the body, helps power you up hills and stairs and supports your hip and pelvis while squatting and lunging. Treatment for a gluteus maximus injury depends on the type and severity of the injury.

Your nose is comprised of bone and cartilage, separated into two symmetrical hollow nostrils. Open sinus spaces sit in your forehead, at the top of your nostrils. As part of the respiratory system, the nose serves several functions.

Solid mineral crystals in your bones impart them with the strength and rigidity to support your body and withstand powerful physical stresses. Calcium and phosphorus are the most abundant minerals in your bones, together forming calcium phosphate crystals.

Everyone needs adequate amounts of calcium to maintain healthy teeth and bones. Besides this, you also need this mineral for proper muscular contraction, ensuring normal enzyme function and blood clotting, and maintaining a regular heart rate.

The human body contains 3 types of muscle tissue: smooth, cardiac and skeletal. Skeletal muscles are responsible for locomotion and other body movements under voluntary control. The body includes more than 600 skeletal muscles of various shapes and sizes.

Paralysis, or the inability to move or feel part of the body, is a symptom of many disorders and afflictions. While paralysis can occur due to stroke or back injury, other causes of paralysis are less well known.

Drainage from the ear -- medically known as otorrhea -- is usually caused by an infection. Take care to clear the drainage and clean the ear using the appropriate method, as improper cleaning can cause additional damage.