Vocabulary Development: Words Associated with Human Internal Body System and Functions II

The Heart:

The heart is the fifth largest internal organ of the human body. It is an organ that is indispensable in the human body system. It is located within the chest, behind the chest bone, and between the two lobes of the lungs. It consists of four chambers – two atria (singular atrium) – a right atrium and left atrium; two ventricles – right ventricle and left – ventricle.

It is a muscular pumping organ which has a cone shape. The major function of the heart is to pump blood to every part of the body so as to deliver energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More to every cell of the body. The pumping action of the heart is called a heartbeat. The heartbeat can be counted by feeling the pulse at the wrist. It is estimated that man has an average of 72 heartbeats per minute.

The special muscles in the heart which are called cardiac muscles enable it to pump blood continuously. Veins carry blood to the heart while arteries transport blood away from the heart. All arteries except pulmonary arteries