Question

8. Read the following passage carefully and answer the questions
that follow:
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. The
brain cells take 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 2/5 oxygen by then is 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 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 any damage to the heart muscle, the
valves or 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 chamber will become
un-coordinated.
Until the twentieth century, few doctors dared to touch the heart. In
1953 all this changed after twenty years of work, Dr. John Gibbon in
the USA had developed a machine that could take over temporarily
from the heart and lungs. Blood could be routed through the
machine bypassing the heart so that surgeons could work inside it
and see what they were doing the era of open heart surgery had
begun.
In the operating theatre, it gives surgeons the chance to repair or
replace a defective heart. Many parties have had plastic valves
inserted in their hearts when their own was faulty. Many people are
being kept alive with tiny battery operated pacemakers; none of
these repairs could have been made without the heart - lung
machine. But valuable as it is to the surgeons, the heart lung
machine has certain limitations. It can be used only for a few hours
at a time because its pumping gradually damages the bloods cells.
(a) On the basis of your reading of the above passage make notes
on it, using headings & Sub headings. Use recognizable
abbreviations wherever necessary (minimum 4). Supply an
appropriate title to it. (5)
(b) Write a summary of the above passage in about 80 words. (3)

Answer 1

Answer:

which class

Explanation:

please make me braneliest

Answer 2

Answer:

hhhhhhuufgfyh jjhhghhg