The cardiovascular system is responsible for transporting oxygen and nutrients to cells and removing waste products. It consists of the heart, blood vessels, and blood.

The three main types of blood vessels are arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries are tiny blood vessels that connect arteries and veins.

The heart is a muscular organ that pumps blood throughout the body. It consists of four chambers: two atria and two ventricles.

Arteries carry oxygenated blood away from the heart, while veins carry deoxygenated blood back to the heart. Arteries have thicker walls than veins, and arteries are larger than veins.

Capillaries are tiny blood vessels that connect arteries and veins. They are responsible for exchanging oxygen and carbon dioxide between blood and cells.

Blood pressure is the force exerted by blood on the walls of blood vessels. It is measured in millimeters of mercury (mm Hg).

The normal blood pressure range for adults is 120/80 mm Hg. This means that the systolic blood pressure (the pressure when the heart beats) is 120 mm Hg and the diastolic blood pressure (the pressure when the heart rests) is 80 mm Hg.

Hypertension is high blood pressure. It is a major risk factor for heart disease, stroke, kidney disease, and other health problems.

Hypotension is low blood pressure. It can be caused by a number of factors, including dehydration, blood loss, and certain medications.

A heart attack occurs when a blood vessel that supplies blood to the heart is blocked. This can cause the heart muscle to die due to lack of blood flow.

A stroke occurs when a blood vessel that supplies blood to the brain is blocked. This can cause brain cells to die due to lack of blood flow.

The risk factors for cardiovascular disease include high blood pressure, high cholesterol, diabetes, smoking, obesity, physical inactivity, and family history of cardiovascular disease.

There are many ways to prevent cardiovascular disease, including eating a healthy diet, getting regular exercise, maintaining a healthy weight, quitting smoking, reducing alcohol intake, managing stress, and getting regular checkups and taking medications as prescribed by your doctor.

The symptoms of cardiovascular disease can include chest pain, shortness of breath, fatigue, numbness or tingling in the arms or legs, blurred vision, and difficulty speaking.

Cardiovascular disease is the leading cause of death in the United States. It is responsible for more deaths each year than cancer, stroke, and diabetes combined.