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| 1. |
Mechanisms fo heart and lungs |
| Answer» Heart: Heart is a muscular organ; which is composed of cardiac muscles. It is so small that it can fit inside and adult’s fist. The heart is a pumping organ which pumps the blood. The human heart is composed of four chambers, viz. right auricle, right ventricle, left auricle and left ventricle.Lungs: The breathing mechanism of lungs is controlled by the diaphragm and the intercostalis muscles. The human respiratory system is composed of a pair of lungs. Diaphragm is a membrane which separates the thoracic chamber from the abdominal cavity. When diaphragm moves down, the lungs expand and air is inhaled. When diaphragm moves up, the lungs contract and air is exhaled. | |