Your red blood cells carry oxygenated blood throughout the entire body. In apparently healthy adults, the red blood cells that pass through the lungs are between 95 and 100 percent saturated with oxygen. Each red blood cell is able to carry four molecules of oxygen.

The human body contains many thousands of different types of proteins. Each protein has its own job to do, such as clotting blood, regulating metabolism, and fighting off bacterial and viral infections. The total protein blood test measures the amount of all proteins found in the liquid part of the blood.

One of the reasons the body's temperature is so carefully controlled to stay in a narrow range is that it affects how different chemical reactions work. Changes in temperature can affect the activity of special proteins known as enzymes, which are needed for many of the processes essential to life.

Sodium is an electrolyte that helps regulate blood pressure and fluid levels in your body; it also plays a role in the normal function of nerves and muscles. A blood sodium level below 135 mmol/L is considered low.

High cholesterol presents a major risk factor for heart disease, the leading cause of death in the United States. The Centers for Disease Control and Prevention estimate that over 70 million Americans had high LDL or "bad cholesterol" levels.

If your doctor says you have high enzymes, he is referring to an elevated liver enzyme level. High enzymes in your liver indicate damage to the cells or inflammation in your liver. Inflamed liver cells leak higher-than-normal amounts of liver enzymes into the bloodstream.

Many illnesses can cause bloody phlegm, also known as sputum. According to Merck Manuals Online Medical Library, most of these causes are related to diseases and conditions of the respiratory system. Some of the illnesses that can cause bloody sputum are more benign than others.

Fasting hypoglycemia is a type of hypoglycemia, or low blood sugar, that occurs when the stomach is empty. Fasting hypoglycemia is diagnosed as a blood glucose level of less than 50mg/dL, according to the National Diabetes Information Clearinghouse.

When you cut yourself or scrape the skin, the blood will flow freely at first, then slow and begin the process of forming a clot. Eventually the injury will scar over and heal. Large, deep cuts that lose blood easily or injuries to arteries can be very dangerous.

Red blood cells are the most abundant type of blood cell. They carry oxygen through the body from the lungs to the tissues. A low red blood cell count is called anemia. There are several ways to classify anemia. One way is by the size of individual red blood cells.

Blood clots are clumps of blood that form in the blood vessels and can travel into the heart, lungs and brain. Blood clots can cause conditions such as strokes, angina, arterial embolisms, deep vein thrombosis, heart attacks, pulmonary embolisms and renal vein thrombosis.

Lifting weights is an effective way to build and strengthen muscles, but it can put a lot of stress on your body, particularly your muscles and blood vessels.