Question

Name the following.
(i) The straw coloured fluid part of the blood.
(ii) The red pigment in RBCs.
(iii) Any two organelles absent in mature RBCs.

Answer 1

Blood:

1. Blood is the fluid that circulates throughout the body and transports oxygen and nutrients to all the organs.
2. The components of the blood are plasma and formed elements.
3. A straw-colored fluid that gives liquid nature to the blood is called the plasma.
4. The plasma is responsible for various functions which include maintaining the body's pH and heat, containing clotting factors, immunity, etc.

RBCs:

1. Red Blood Corpuscles (RBCs), also known as erythrocytes are the kind of cells that are present most abundant in the blood.
2. RBCs are red-colored, biconcave, and disc-shaped.
3. The red color of the RBCs is due to the presence of respiratory, iron-containing pigment hemoglobin.
4. The hemoglobin acts as an oxygen carrier molecule.

Mature RBCs:

1. When RBCs or erythrocytes mature, they become enucleated, that is they lack nuclei to carry more hemoglobin for oxygen transport.
2. In order to increase the flexibility of their movement and to prevent the usage of oxygen they carry, the mammalian RBCs lack other cell organelles like the endoplasmic reticulum and mitochondria.