Question

Human mature red blood cells (RBCs) do not contain
A. Iron
B. Cytoplasm
C. Mitochondria
D. Haemoglobin

Answer 1

Hint: The mature red human blood cell is tiny, oval, and biconcave; in profile, it appears dumbbell-shaped. When it moves through incredibly narrow blood vessels, the cell is versatile and assumes a bell – shaped.

Complete Answer:
Red blood cells , often known as erythrocytes, are cellular blood elements, millions of which bring the blood its distinctive colour in the movement of vertebrates and transport oxygen from the lungs to the tissues.
Now, let us find the solution from the options-
- A membrane consisting of lipids and proteins is filled by red blood cells, lacking a nucleus, and includes haemoglobin, a red iron-rich oxygen-binding protein. Thus, option A is not the correct option.
- In order to contain the organelles, cytoplasm is found in red blood cells and is the area in which most cell functions occur. Thus option B is not the correct option.
- Red blood cells in humans are developed in the bone marrow and distributed as matured RBCs. At maturity, these cells have no nucleus and mitochondria. These cells can not need the oxygen they carry, because of the lack of mitochondria. This oxygen is thus accessible to tissues in the body.
- The red cell and its haemoglobin purpose is to bring oxygen to all body tissues from the gills or lungs and to bring carbon dioxide, a waste product of digestion, to the lungs where it is removed from the body. Thus option D is not the correct option.

Thus, the correct answer is option (C) Mitochondria.

Note: Oxygen-carrying pigment is held freely in the plasma in invertebrates; its concentration present in red cells in vertebrates is more successful and constitutes an essential evolutionary advancement in order to exchange carbon dioxide and oxygen as gases.