Cardiovascular Exercises

WHAT You know it by now: regular aerobic exercise improves longevity. Using large muscle groups over longer periods of time, they help get your heart rate up, increase blood circulation,…

CARDIOVASCULAR SYSTEM

THE CARDIOVASCULAR SYSTEM and the blood contained in its vessels are the body’s transport system. The heart pumps blood around two circuits of blood vessels. The main (systemic) circuit carries…

BLOOD VESSELS

The cardiovascular system includes three types of blood vessels: arteries, veins, and capillaries. Placed end to end, they would circle the Earth nearly four times. The smallest vessels, the capillaries,…

STRUCTURE OF THE HEART

The heart is a hollow muscular pump consisting mainly of myocardium, a type of muscle that can work without resting. The interior of the heart is divided into two halves,…

HEART BEATS

A single pumping action of the heart is called a heartbeat. A healthy adult heart beats at a rate of 60-80 beats per minute at rest and at up to…

BLOOD CIRCULATION

Blood circulates in two linked circuits: the pulmonary, which carries blood to the lungs to be oxygenated, and the systemic, which supplies oxygenated blood to the body. Arteries carrying blood…

ECG

ECG(electrocardiography) is used to record the electrical activity of the heart. The procedure is frequently used to diagnose abnormal heart rhythms and to investigate the cause of chest pain. Several…

Coronary Angiography

Coronary angiography is used to image the arteries that supply the heart muscle with blood. Angiography can image narrowed or blocked coronary arteries, which are not visible on a normal…