HEART - CARDIOVASCULAR

FUNCTION HEART



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

FUNCTION OF THE HEART

The heart’s duties are much broader than simply pumping blood continuously throughout life. The heart must also respond to changes in the body’s demand for oxygen.

The heart works very differently during sleep, for example, than in the middle of a 5-km (3-mi) run. Moreover, the heart and the rest of the circulatory system can respond almost instantaneously to shifting situations—when a person stands up or lies down, for example, or when a person is faced with a potentially dangerous situation.

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.

Next: Diseases and Disorders

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