Your cardiovascular system is made up of your heart, arteries, veins and capillaries. The heart has four separate chambers--two atria, or upper chambers, and two ventricles, or lower chambers. The right atrium and ventricle accept blood from your body and pump it into your lungs.

The human body has 11 major organ systems, each with specific functions and energy needs. The cardiovascular system, or CVS, serves all of them, delivering vital nutrients, picking up and distributing metabolic products and carrying away waste for elimination.

The carotid artery carries blood from the heart to the head and brain. There are two carotid arteries, one on each side of the neck. Over time, carotid arteries can become clogged with plaque as a result of coronary artery disease.

Toe sprains result from partial tears to the ligaments in your toe. These ligaments connect one bone to the next. You can sprain a toe by stubbing it on a hard object or even by stepping and stopping abruptly, forcing the toe into the end of your shoe.

The rhythm method, also called the fertility awareness method, is a form of pregnancy prevention where couples calculate a woman's fertile time using a calendar and fertility signals, like cervical mucus and date of her last menstrual period.

Testosterone performs a number of significant functions in the human body. In both men and women, testosterone governs muscle and bone formation, overall sense of vitality and sex drive. Like any hormone, testosterone has some negative side effects.

Cholesterol and triglycerides are substances in the body known as lipids. When both of these levels become elevated, it is known as a lipid disorder. If only your triglyceride levels rise, it is called hypertriglyceridemia.

Roses are known for their subtle but appealing fragrance. For this reason, roses are an expensive, popular flower. But the value of roses isn't only aesthetic -- the oil produced by roses has several applications in alternative medicine. Rose oil is used to improve your body's circulation and boost the immune system.

It is not possible to confirm or rule out pregnancy on the basis of one or even several symptoms. Until your doctor detects a fetal heartbeat, any pregnancy symptoms you have experienced are merely indicators that you may be pregnant, says the American Pregnancy Association, or APA.

Blood pressure is used as a general diagnostic tool to determine heart health. Blood pressure numbers can help physicians diagnose, treat and predict medical problems. Monitoring your own blood pressure at home is a good way to keep track of your heart's health.

The colon, or large intestine, is an essential organ for absorbing nutrients, synthesizing vitamins and regulating water levels in the body. Lack of a well balanced diet, especially foods high in fiber, can lead to clogging of the colon.

Your heart is the center of your cardiovascular system, and it is vitally responsible for just about everything that gives your body life -- ranging from the transportation of oxygen to the success of your immune system.