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    <pre style="white-space:pre-line"><code>9. Transport  eLearn.Punjab

9.2.1 BLOOD

Blood is a specialized body fluid (a connective tissue) that is composed of a liquid called blood
plasma and blood cells. The weight of blood in our body is about 1/12th of our body. The average
adult body has about 5 litres of blood.
In a healthy person, plasma constitutes about 55% by volume of blood, and cells or cell-like bodies
are about 45% by volume of the blood (Figure 9.11).

                                                    Figure 9.11: Percentage composition of human blood

BLOOD PLASMA

Plasma is primarily water in which proteins, salts, metabolites and wastes are dissolved.Water
constitutes about 90-92% of plasma and 8-10% are dissolved substances.

                                                      23

                                                                                                                       V: 1.1</code></pre>
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