Chapter 14 (Transport) F.Sc 1st Year Biology Short Questions

Name the mammals having nucleated RBC.

Camel and Llama.

What is the shape of erythrocytes?

These cells are biconcave in mammals and have an elastic cell membrane. They are not biconcave, but oval or spherical in shape in all the other vertebrates.

Where RBC are formed in man?

Red blood cells are formed principally in the red bone narrow of short bones, such as the sternum, ribs and vertebrae. In the embryonic life, they are formed in the liver and spleen.

What is the function of RBC?

Their main function is to transport oxygen and carbon dioxide.

What is number of RBC and WBC in 1 mm of blood?

A cubic millimetre of blood contains 5-512 million of RBC in males and 4-492 million in females. On cubic millimetre of blood contains 7000 to 8000 of WBC (leucocytes).

What is the function of lymphocytes?

Lymphocytes help to provide immunity against the disease.

What are platelets?

These are not cells, but are fragments of large cells called megakaryocytes, about 2-3um in diameter.

What is the composition of wall of heart?

The wall of the heart is composed of three layers:

  • Endocardium – outermost layer
  • Myocardium – middle layer
  • Epicardium – innermost layer

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