Read the passage carefully and prepare notes using appropriate abbreviations. 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 cells need a constant supply of oxygen , especially those in the brain.The brain cells live only four to five minutes after their oxygen is cut off, and then death comes to the entire body.
The heart is a specialized muscle that serves a pump. This pump is divided into four chambers connected by tiny doors called walls. The chambers work to keep blood flowing round the body, in a circle. . The chambers work to keep blood flowing round the body ,in a circle.
Answers
Answer:
Notes:
1. Function of Heart
(a) Vital for living
(b) never stops wrkg.
(c) Supplies oxygen rich blood to diff. Parts of the body.
2. Structure of the heart:
(a) divided into 4 chambers connected by valves
(b) Blood purified in the lungs.
(c) Arteries carry pure blood to diff. Part of the body.
3. Heart disease – causes:
(a) Weak muscles
(b) Defective valves
(c) Defective pace maker
4. History of open heart Surgery:
(a) HLM invented by Dr. Gibbon in 1953
(b) Enabled open heart surgery
(c) Limitation
(i) can be used only for a few hrs. at a time.
(ii) damages
Summary:-
The heart is a vital organ of the body, which never stops working. It supplies oxygen rich blood to all parts of the body. It is divided into four chambers inter connected by valves. Blood is purified in the lungs and arteries carry it to different parts of the body. Heart disease has various cause such as weak muscles defective valves or a defective pace maker. The era of open-heart surgery began in 1953 when Dr. Gibbon developed the heart lung machine. Replacement of valves and other areas of a damaged heart is now possible.