Multiple choice

In human adults, about 5 litres of blood contributes 7-8% of the body weight. Which of the following statements regarding blood composition is false?

  1. Leukocytes can leave the blood stream.

  2. Blood cells have epithelial origin.

  3. Erythrocytes contribute about 43% of the total volume of the blood.

  4. The blood platelets perform their functions exclusively in the blood stream.

  5. Erythrocytes are the dominant cells in the blood.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood is sometimes considered to be a fluid connective tissue because of the mesenchymal origin of its cells and a low ratio of cells to liquid intercellular substance, the blood plasma.

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