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ARNICLES

DIAGNOSING HEART DISEASE: EXTERNAL EXAMINATION

THE IMPENDING HEART ATTACK AND THE ACUTE STAGE: WHAT SHOULD THE PATIENT AND RELATIVES NOT DO?

THE HEART'S WORK

HEART DISEASE: VISITING YOUR PHYSICIAN

THE IMPENDING HEART ATTACK AND THE ACUTE STAGE: WHAT CAN RELATIVES DO IF A HEART ATTACK IS SUSPECTED?

THE MYOCARDIUM (HEART MUSCLE): THE CARDIAC CYCLE

SYMPTOMS OF HEART DISEASE: BREATHLESSNESS, HEARTBEAT AND FAINTING

THE IMPENDING HEART ATTACK AND THE ACUTE STAGE: THE DANGERS OF THE FIRST HOURS

THE MYOCARDIUM (HEART MUSCLE): THE ATRIA & THE VENTRICLES

THE HEART VALVES: LOCATION AND STRUCTURE OF THE VALVES

THE HEART VALVES: LOCATION AND STRUCTURE OF THE VALVES

Although the pumping action of your would not ensure effective blood flow heart is certainly effective at ejecting through the figure-eight circulatory blood from the chambers, it alone would not ensure effective blood flow through the circulatory loop. Any pumping system require method to guarantee that the pumped fluid goes in the desired direction. This is the purpose of the valves.

Each valve in your heart opens and closes once with each heartbeat (or about once every second throughout your lifetime).

Location and Structure of the Valves

There are four valves in your heart: the tricuspid, mitral, pulmonary, and aortic (see Figure 3, page A1). The valves are strong, thin leaflets of tissue anchored to the myocardium. The leaflets consist of single sheets of fibrous tissue covered by endocardial cells. At the base of each valve leaflet, the fibrous layer merges with the myocardium to form a flexible hinge, called the annulus.

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Cardio & Blood