write the funtions of three blood cells
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Red blood cells carry oxygen. ...
White blood cells ward off infection.
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Types of Blood Cells
We have seen blood consist of cells known as formed elements of blood. These cells have their own functions and roles to play in the body. The blood cells which circulate all around the body are as follows:
Red blood cells (Erythrocytes)
RBCs are the biconcave cells and without nucleus in humans; also known as erythrocytes. RBCs contain the iron-rich protein called haemoglobin; give blood its red colour. RBCs are the most copious blood cell produced in bone marrows. Their main function is to transport oxygen from and to various tissues and organs.
White blood cells (Leucocytes)
Leucocytes are the colourless blood cells. They are colourless because it is devoid of haemoglobin. They are further classified as granulocytes and agranulocytes. WBCs mainly contribute to immunity and defence mechanism.
Red Blood Cells
Red Blood Cells are red due to Hemoglobin, which is a transport molecule and also a pigment. As a result, blood is red.
Types of White Blood Cells
There are five different types of White blood cells and are classified mainly based on the presence and absence of granules.
Granulocytes
Agranulocytes
White Blood Cells
There are five types of white blood cells present in the blood
Granulocytes
They are leukocytes, with the presence of granules in their cytoplasm. The granulated cells include- eosinophil, basophil, and neutrophil.
Eosinophils
They are the cells of leukocytes, which are present in the immune system.
These cells are responsible for combating infections in parasites of vertebrates and for controlling mechanisms associated with the allergy and asthma.
Eosinophil cells are small granulocyte, which is produced in the bone marrow and makes 2 to 3 per cent of whole WBCs. These cells are present in high concentrations in the digestive tract.
Basophils
They are the least common of the granulocytes, ranging from 0.5 to 1 per cent of WBCs.
They contain large cytoplasmic granules, which plays a vital role in mounting a non-specific immune response to pathogens, allergic reactions by releasing histamine and dilates the blood vessels.
These white blood cells have the ability to be stained when exposed to basic dyes, hence referred to as basophil.
These cells are best known for their role in asthma and their result in the inflammation and bronchoconstriction in the airways.
They secrete serotonin, histamine and heparin.
Neutrophils
They are normally found in the bloodstream.
They are predominant cells, which are present in pus.
Around 60 to 65 per cent of WBCs are neutrophils with a diameter of 10 to 12 micrometres.
The nucleus is 2 to 5 lobed and cytoplasm has very fine granules.
Neutrophil helps in the destruction of bacteria with lysosomes, and it acts as a strong oxidant.
Neutrophils are stained only using neutral dyes. Hence, they are called so.
Neutrophils are also the first cells of the immune system to respond to an invader such as a bacteria or a virus.
The lifespan of these WBCs extend for up to eight hours and are produced every day in the bone marrow.
Agranulocytes
They are leukocytes, with the absence of granules in their cytoplasm. Agranulocytes are further classified into monocytes and lymphocytes.
Monocytes
These cells usually have a large bilobed nucleus, with a diameter of 12 to 20 micrometres.
The nucleus is generally of half-moon shaped or kidney-shaped and it occupies 6 to 8 per cent of WBCs.
They are the garbage trucks of the immune system.
The most important functions of monocytes are to migrate into tissues and clean up dead cells, protect against the bloodborne pathogens and they move very quickly to the sites of infections in the tissues.
These white blood cells have a single bean-shaped nucleus, hence referred to as Monocytes.
Lymphocytes
They play a vital role in producing antibodies.
Their size ranges from 8 to 10 micrometres.
They are commonly known as natural killer cells.
They play an important role in body defence.
These white blood cells are colourless cells formed in lymphoid tissue, hence referred to as lymphocytes.
There are two main types of lymphocytes – B lymphocytes and T lymphocytes.
These cells are very important in the immune systems and are responsible for humoral and cell-mediated immunity.
Platelets (Thrombocytes)
Thrombocytes are specialized blood cells produced from bone marrow.
Platelets come into play when there is bleeding or haemorrhage.
They help in clotting and coagulation of blood. Platelets help in coagulation during a cut or wound.
Hope this helps
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We have seen blood consist of cells known as formed elements of blood. These cells have their own functions and roles to play in the body. The blood cells which circulate all around the body are as follows:
Red blood cells (Erythrocytes)
RBCs are the biconcave cells and without nucleus in humans; also known as erythrocytes. RBCs contain the iron-rich protein called haemoglobin; give blood its red colour. RBCs are the most copious blood cell produced in bone marrows. Their main function is to transport oxygen from and to various tissues and organs.
White blood cells (Leucocytes)
Leucocytes are the colourless blood cells. They are colourless because it is devoid of haemoglobin. They are further classified as granulocytes and agranulocytes. WBCs mainly contribute to immunity and defence mechanism.
Red Blood Cells
Red Blood Cells are red due to Hemoglobin, which is a transport molecule and also a pigment. As a result, blood is red.
Types of White Blood Cells
There are five different types of White blood cells and are classified mainly based on the presence and absence of granules.
Granulocytes
Agranulocytes
White Blood Cells
There are five types of white blood cells present in the blood
Granulocytes
They are leukocytes, with the presence of granules in their cytoplasm. The granulated cells include- eosinophil, basophil, and neutrophil.
Eosinophils
They are the cells of leukocytes, which are present in the immune system.
These cells are responsible for combating infections in parasites of vertebrates and for controlling mechanisms associated with the allergy and asthma.
Eosinophil cells are small granulocyte, which is produced in the bone marrow and makes 2 to 3 per cent of whole WBCs. These cells are present in high concentrations in the digestive tract.
Basophils
They are the least common of the granulocytes, ranging from 0.5 to 1 per cent of WBCs.
They contain large cytoplasmic granules, which plays a vital role in mounting a non-specific immune response to pathogens, allergic reactions by releasing histamine and dilates the blood vessels.
These white blood cells have the ability to be stained when exposed to basic dyes, hence referred to as basophil.
These cells are best known for their role in asthma and their result in the inflammation and bronchoconstriction in the airways.
They secrete serotonin, histamine and heparin.
Neutrophils
They are normally found in the bloodstream.
They are predominant cells, which are present in pus.
Around 60 to 65 per cent of WBCs are neutrophils with a diameter of 10 to 12 micrometres.
The nucleus is 2 to 5 lobed and cytoplasm has very fine granules.
Neutrophil helps in the destruction of bacteria with lysosomes, and it acts as a strong oxidant.
Neutrophils are stained only using neutral dyes. Hence, they are called so.
Neutrophils are also the first cells of the immune system to respond to an invader such as a bacteria or a virus.
The lifespan of these WBCs extend for up to eight hours and are produced every day in the bone marrow.
Agranulocytes
They are leukocytes, with the absence of granules in their cytoplasm. Agranulocytes are further classified into monocytes and lymphocytes.
Monocytes
These cells usually have a large bilobed nucleus, with a diameter of 12 to 20 micrometres.
The nucleus is generally of half-moon shaped or kidney-shaped and it occupies 6 to 8 per cent of WBCs.
They are the garbage trucks of the immune system.
The most important functions of monocytes are to migrate into tissues and clean up dead cells, protect against the bloodborne pathogens and they move very quickly to the sites of infections in the tissues.
These white blood cells have a single bean-shaped nucleus, hence referred to as Monocytes.
Lymphocytes
They play a vital role in producing antibodies.
Their size ranges from 8 to 10 micrometres.
They are commonly known as natural killer cells.
They play an important role in body defence.
These white blood cells are colourless cells formed in lymphoid tissue, hence referred to as lymphocytes.
There are two main types of lymphocytes – B lymphocytes and T lymphocytes.
These cells are very important in the immune systems and are responsible for humoral and cell-mediated immunity.
Platelets (Thrombocytes)
Thrombocytes are specialized blood cells produced from bone marrow.
Platelets come into play when there is bleeding or haemorrhage.
They help in clotting and coagulation of blood. Platelets help in coagulation during a cut or wound.
Hope this helps
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