Question

Q1. Read the passage carefully and prepare notes using appropriate abbreviations. 1X3 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.​

Answer 1

Explanation:

Germination, the sprouting of a seed, spore or other reproductive body, usually after a period of dormancy. The absorption of water, the passage of time, chilling, warming, oxygen availability, and light exposure may all operate in initiating the process

Answer 2

NOTES:

THE HEART OF THE BODY

1. The heart is a crucial organ of the body.
2. Its work is ceaseless and constant.
3. It keeps the organs in the body alive.
4. If it stops working for a while, the body will die.

FUNCTIONS OF HEART

1. Funct. of the heart is to pump oxy. rich blood throughout the body.
2. All body cells need a constant supply of oxy.
3. The brain cells can live only four to five minutes after the oxy. supply is cut off.

STRUCTURE OF HEART

1. The heart serves as a pump.
2. It is divided into four chambers.
3. Chambers are connected by tiny gates called valves.
4. The chambers pump blood throughout the body in a circle.

Abbreviations

Funct. : Function

oyg. : oxygen

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