Question

Blood consists of two parts, a liquid part and a cellular part. Name these parts and briefly write about them.

Answer 1

Hint: About $55\%$ of blood comprises the liquid portion while about $45\%$ of blood comprises a cellular part. The liquid part of blood contains water, salts, and proteins while the cellular part of blood is made up of cells that carry oxygen, fight infections, and help in the clotting of the blood.

Complete answer:
Blood, in humans, is a part of the circulatory system. This blood is composed of liquid and cellular parts. The liquid part is called the plasma or blood plasma that makes about $55\%$ of blood portion. The cellular part comprises about $45\%$ of blood portion and contains cells i.e., red blood cells, white blood cells, and platelets.
Description about plasma, red blood cells, white blood cells, and platelets
Plasma: It is made up of water ($90 - 92\%$) and proteins ($6 - 8\%$). Major proteins present in the blood plasma include fibrinogen, albumins, and globulins. It also contains a small amount of mineral and clotting factors in its inactive forms. The main role of plasma is to take nutrients, hormones, and certain proteins to different parts of the body that need it. Also, the waste products from the cell are collected by the blood plasma which therefore helps in removing these wastes out from the body.
Red blood cells (RBCs): RBCs are also known as erythrocytes and are the most abundant cells in the blood. These cells are devoid of the nucleus and are biconcave in shape. The main role of RBCs is to deliver oxygen to different parts of the body from the lungs. The color of RBCs is red due to the presence of a red-colored pigment called hemoglobin to which oxygen attaches and is then transported to different parts of the body.
White blood cells (WBCs): WBCs are also known as leukocytes. They possess a nucleus and are colorless due to the absence of hemoglobin. The main role of WBCs is to fight against infections and thus form part of the immune system.
Platelets: They are also known as thrombocytes. They are the cell fragments that help in the clotting of blood when a person has a cut or wound, thus, prevents bleeding.

Note: Blood is composed of plasma (liquid part) and RBCs, WBCs, platelets (cellular part). Plasma helps in providing nutrients, hormones, and proteins to the body and in turn, excreting out waste from the body. All the cells of the blood are formed by the bone marrow. RBCs live for about 120 days, platelets live for about 6 days and some WBCs live less than a day while others live much longer.