HEART - CARDIOVASCULAR

HEART VALVES



HEART:
" INTRODUCTION
" STRUCTURE OF THE HEART
" Heart Valves
" Myocardium
" Pericardium
" Endocardium
" Coronary Arteries
" FUNCTION OF THE HEART
" Cardiac Cycle
" Generation of the Heartbeat
" Control of the Heart Rate
" Cardiac Output
" DISEASES OF THE HEART
" Coronary Heart Disease
" Congenital Defects
" Heart Valve Malfunction
" Arrhythmias
" Other Forms of Heart Disease
" Heart Failure
" HISTORY OF HEART RESEARCH

Heart Valves

Four valves within the heart prevent blood from flowing backward in the heart. The valves open easily in the direction of blood flow, but when blood pushes against the valves in the opposite direction, the valves close. Two valves, known as atrioventricular valves, are located between the atria and ventricles.

The right atrioventricular valve is formed from three flaps of tissue and is called the tricuspid valve. The left atrioventricular valve has two flaps and is called the bicuspid or mitral valve. The other two heart valves are located between the ventricles and arteries. They are called semilunar valves because they each consist of three half-moon-shaped flaps of tissue. The right semilunar valve, between the right ventricle and pulmonary artery, is also called the pulmonary valve. The left semilunar valve, between the left ventricle and aorta, is also called the aortic valve.

World Health Organization

Circulatory System

Circulatory System, or cardiovascular system, in humans, the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products.

Next: Circulatory System

Circulatory Diseases and Disorders

Disorders of the circulatory system include any injury or disease that damages the heart, the blood, or the blood vessels. The three most important circulatory diseases are hypertension, arteriosclerosis, and atherosclerosis.

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Respiratory System

Respiratory System, in anatomy and physiology, organs that deliver oxygen to the circulatory system for transport to all body cells. Oxygen is essential for cells, which use this vital substance to liberate the energy needed for cellular activities.

Next: Respiratory System