Question

Do red blood cells have nucleus?

Answer 1

Red blood cells, also known as red cells, red blood corpuscles, haematids, erythroid cells, or erythrocytes, are the most prevalent form of blood cell and the vertebrate's primary mechanism of providing oxygen to body tissues through blood flow. A kind of blood cell that is produced in the bone marrow and circulated throughout the body. Hemoglobin is a protein found in red blood cells that transports oxygen from the lungs to all regions of the body.

Complete answer:
To accommodate a greater amount of haemoglobin in the cells, mature red blood cells (RBCs) lack a nucleus as well as other cell organelles such as mitochondria, Golgi apparatus, and endoplasmic reticulum. Immature red blood cells, on the other hand, have a nucleus.
Hemoglobin provides oxygen-carrying capacity to RBCs. It also allows the cell to have its characteristic bi-concave form, which helps diffusion; this shape would be impossible if the cell had a nucleus in the way. RBCs in some mammals, such as camels, are nucleated.
The nucleus of red blood cells (erythrocytes) is present when they are formed in the bone marrow. The cell will expel its nucleus throughout development, a process known as enucleation. Red blood cells do not have a nucleus when they enter circulation.
The cell's lack of a nucleus is an adaptation to better prepare it for its purpose. It can carry more oxygen because it doesn't have a nucleus. The cell is also more flexible, making it easier for it to move through capillaries half the size of the cell.

Note:-
A thin membrane surrounds the red blood cell, which is made up of chemically complicated lipids, proteins, and carbohydrates in a highly structured structure. RBCs, also known as erythrocytes, are the most prevalent form of blood cell, with 4-6 million cells in every cubic millimetre of blood. RBCs are small enough to fit through the smallest blood vessels, with a diameter of only 6 m.