Question

What type of blood cells contain haemoglobin, which binds with oxygen, and allows these cells to carry oxygen to the parts of the body that needs it?

Answer 1

Hint: Blood is a connective tissue consisting of the fluid matrix, plasma, and formed elements. It is the most common medium of nutrient transport fluid in animals. Lymph is another liquid medium that helps in the transport of certain substances.

Complete answer:
Erythrocytes are known as the Red Blood Cells or RBCs. They are the most abundant cells formed in the bone marrow in adults. The nucleus is absent in RBCs. They are biconcave in shape and have red-colored iron-containing a complex known as hemoglobin. The life span of RBCs is 120 days and they are destroyed in the spleen. The main functions of Red blood cells are:
The purpose of red blood cells and hemoglobin is to transport oxygen from the lungs or gills to all body tissues, as well as carbon dioxide, a waste product of cellular respiration and metabolism, to the lungs, where it is excreted.
Additional information: Leukocytes are also known as White Blood Cells or WBCs. They are colorless due to a lack of hemoglobin. They are short-lived and are nucleated. WBCs are of two types-
Granulocytes- They comprise Neutrophils, eosinophils, and basophils.
Neutrophils are monocytes and phagocytic cells which destroy foreign organisms entering the body. Basophils secrete amino acids and hormones such as histamine, serotonin, etc. They are involved in inflammatory reactions. Eosinophils are associated with allergic reactions and resist infections.
Agranulocytes- Agranulocytes include lymphocytes and platelets. Lymphocytes are of two types, B cells, and T cells. They make the immune system of the organism’s body. Another name of platelets is thrombocytes. They release substances responsible for the coagulation and clotting of blood.

Note:
Plasma is a straw-colored, viscous fluid that is mostly made of water and proteins. Major proteins are fibrinogen, globulins and albumins. Fibrinogen aids in the clotting of blood. Globulins help in the defense mechanism and albumin aids in maintaining the osmotic pressure of the body.