Question:

There is no DNA in

Updated On: Aug 1, 2022
  • A mature spermatozoan
  • Hair root
  • An enucleated ovum
  • Mature RBC
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The Correct Option is D

Solution and Explanation

Erythropoiesis is the formation of red blood cells (erythrocytes), which occurs in the red bone marrow. The earliest precursor that can be distinguished microscopically is the proerythroblast, which develops from a haemopoietic stem cell and gives rise successively to the early erythroblast, intermediate erythroblast, and the late erythroblast, in which most haemoglobin is synthesized. In mammals the nucleus is then forced out of the cell, which assumes a biconcave shape and is known as a reticulocyte. Reticulocytes are released into the blood and develops into mature erythrocytes.
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Concepts Used:

Blood

Blood is a fluid-like structure that is responsible for transporting oxygen and other nutrients to all the cells of the body. Blood shows characteristics of both tissues and fluid.

Composition of Blood:

Blood is composed of the below-mentioned parts:

  • Plasma
  • Blood Cells
  • Platelets

Types of Blood Cells:

The two types of blood cells present in the body are:

RBC (Red Blood Cells)

RBC’s are also known as Erythrocytes. They are biconcave and are present without a nucleus in human beings. It contain Haemoglobin which is an iron-rich protein due to which the color of blood is red. RBC’s are produced in the bone marrow which is mainly responsible for the transportation of oxygen to and from various tissues and organs present in the human body.

WBC (White Blood Cells)

WBC’s are also known as Leucocytes which are colourless blood cells due to the absence of haemoglobin. They are further divided into two categories such as granulocytes and agranulocytes. Their main responsibility is to provide immunity and maintain defence mechanisms in the human body.