Question

The work of the heart can never be interrupted. The heart's job is to keep oxygen-rich blood flowing through the body. All the body's cells need a constant supply of oxygen, especially those in the brain. Brain cells live only four to five minutes after their oxygen is cut off, and death comes to the entire body
The heart is a specialized muscle that serves as a pump. This pump is divided into four chambers connected by tiny doors called valves. The chambers work to keep the blood flowing round the body in a circle.
At the end of each circuit, veins carry the blood to the right atrium, the first of the four chambers. Its oxygen has been used up and it is on its way back to the lung to pick up a fresh supply and to give up the carbon dioxide it has accumulated. From the right atrium the blood flows through the tricuspid valve into the second chamber, the right ventricle. The right ventricle contracts when it is filled, pushing the blood through the pulmonary artery, which leads to the lungs. In the lungs the blood gives up its carbon dioxide and picks up fresh oxygen. Then it travels to the third chamber, the left atrium. When this chamber is filled it forces the blood through the mitral valve to the left ventricle. From here it is pushed into a big blood vessel called aorta and sent round the body by way of arteries.
Heart disease can result from damage to the heart muscle, the valves of the pacemaker. If the muscle is damaged, the heart is unable to pump properly. If the valves are damaged, blood cannot flow normally and easily from one chamber to another, and if the pacemaker is defective the contractions of the chambers will become uncoordinated.
Questions:
(a) Which main task is performed by heart?
(b) What task is performed by chamber?
(c) What harm does damaged muscle cause to the heart?
(d) Defective pacemaker is not a good indication. Why?​

Answer 1

Answer:

a) the main task performed by heart is pumping blood in the all the body