Human Heart Working Model and Project File for Science Inspire Award. Human heart is a excellent model idea for school projects. Students can also prepare human heart model for their science exhebition. Participate in science inspire award competition and get 10,000 scholarship by making a simple model.
Human Heart Working Model
Inspire Award Hindi Synopsis- Click Here
Inspire Award Project File- Click Here.
Introduction
Heart s a muscular organ located within the chest among the lungs. It is approximately the scale of a fist and is accountable for pumping blood into different parts the body. An average adult heart is about 12 cm. Its weight is an average 300 gm in males and about 250 gm in females. The heart is a hollow, fibromuscular organ of a conical or pyramidal form with upper broad part. Human heart has four chambers 2 atria and 2 ventricles. It pumps blood all through the body in a process called circulation. It is a 24 hour working organ and is responsible for sustaining life . Besides human most other mammals also possess a heart that pumps flood to different parts of their body.
Functions of Human Heart
The function of the human heart is to maintain the constant flow of blood throughout the body.
Maintaining blood pressure.
Receiving deoxygenated blood and carrying metabolic waste from the body and pumping it to the lungs for oxygenation.
Blood delivers oxygen ,hormones, glucose and other components to various parts of body .
Working Of Heart
Both oxygen and carbon dioxide have to be transported by the blood. So, the heart has different chambers to prevent the oxygen rich blood from mixing with the blood containing carbon dioxide. The carbon dioxide rich blood has to reach the lungs for the carbon dioxide to be removed. The oxygenated 42 blood from the lungs has to be brought back to the heart. This oxygen rich blood is then pumped to the rest of the body. The blood is transported step by step. Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left, called left atrium. The left atrium relaxes when it is collecting this blood. It then contracts while the next chamber called left ventricle, expands, so that the blood is transferred to it. When the muscular left ventricle contracts in its turn, the blood is pumped out to the body. Deoxygenated blood comes from the body to the upper chamber on the right called the right atrium, as it expands. As the right atrium contracts, the concerned lower chamber, ie, the right ventricle dilates. This transfers blood to the right ventricle, which in turn pumps it to the lungs for oxygenation. Since ventricles have to pump blood into various organs, they have thick muscular wall than the atria do. Valves ensures that blood does not flow backward when the atria or ventricles contract. The rhythmic contraction and relaxation of a heart is called heartbeat. The heart of healthy person beats 72 times per minute
