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Connective cells Italic text Every living thing is made up of cells they are known as Fundamental unit of life. In humans they are about 300 types of cells of which some are :- RBC's, WBC's,  bone cells, muscle cells. In this article you will be reading about these cells. Contents:- 1. RBC's(red blood cells) 2.WBC's(white blood cells) 3.Bone cells 4.Muscle cells RBC :- The Red blood cell has no nucleaus. It helps in transporting food and oxygen to different parts of body, it has a life span of about 180 days. They are produced in Bone Marrow which is inside every bone. The reason which they are red is due to Haemoglobin present in them which helps them to transfer oxygen. [1]The membrane of the Red Blood Cells is composed of 3 layers :- Glycocalynx :- It is the outer most layer of the RBC it is rich in carbhohydrates. It provides protection to the cell. Lipid Bilayer :- Has transmembrane proteins other than its lipidic constituents. Membrane skeleton:- It is a structural network of protiens located in inner most layer if lipid bilayer. It provides structure and rigidity to the cell.[1]

WBC(white blood cells):- [2]These cells are warriors which fight the diseases, virus in your body. They detect any foreign material and terminate them. Thats why they use someone's brother or sisters organs for transplantation. They are also known as leukocyctes. There are 2 types of them :- Granulocyctes(polymorphonuclear) and Agranulocytes(mononuclear).

Other than this division there is another division in which they are divided into 5 based on thier functions. Neutrophil:- They consist of 62% of the WBC's they have multilobed nucleus, they target fungi and bacteria. Thier life time is 6hrs- few days.

Eosinophil:- They consist of 2.3% of the WBC's they have bi-lobed nucleus, these cells target large parasites and also modulate allergic responses. http://en.wikipedia.org/wiki/White_blood_cells Basiphil:-They consist of 0.4% of WBC's they have a bi-lobed or tri-lobed nucleus, these cells release histamine for infamatory responses.

Lymphocyte:-They consist 30% of WBC's. These cells release anti-bodies and assist the activation of T cells. They target all the cells infected by a tumor and virus. http://en.wikipedia.org/wiki/White_blood_cells Monocyte:- They consist of 5.3% of WBC's. Monocytes migrate from the bloodstream to other tissues and differentiate into tissue resident macrophages, Kupffer cells in the liver. These have a kidney shaped nucleus.[3]

Bone cell: [3]"Bone cells, which are found within the bone tissue, are responsible for the make-up of the skeleton of vertebrates. There are different types of bone tissue in a bone that are made up of different bone cells: there is the compact tissue which is the hard outer part of the bone, the cancellous tissue which is all the spongy tissue inside of the compact tissue, and the subchondral tissue which is the smooth tissue at the end of each bone.[1] Bone cells all work together inside of the bones to help keep up the skeletal system. The bone cells do many things for the skeletal system such as the development of new bones, the maintenance of bones, and the regulation of minerals in the body."[3]

Muscle cells:-[4]" A myocyte (also known as a muscle cell or muscle fiber)[1] is the type of cell found in muscle tissue. They are long, tubular cells that develop from myoblasts to form muscles in a process known as myogenesis.[2] There are various specialized forms of myocytes: cardiac, skeletal, and smooth muscle cells, with various properties. Cardiac myocytes are responsible for generating the electrical impulses that control the heart rate, among other things.

A myoblast is a type of embryonic progenitor cell that differentiates to give rise to muscle cells. Skeletal muscle fibers are made when myoblasts fuse together; muscle fibers therefore have multiple nuclei (each nucleus originating from a single myoblast). The fusion of myoblasts is specific to skeletal muscle (e.g., biceps brachii) and not cardiac muscle or smooth muscle. Myoblasts that do not form muscle fibers dedifferentiate back into satellite cells. These satellite cells remain adjacent to a muscle fiber, situated between the sarcolemma and the endomysium (the connective tissue investment that divides the muscle fascicles into individual fibers).'[4] References:- [1] http://en.wikipedia.org/wiki/Red_blood_cell [2] http://en.wikipedia.org/wiki/White_blood_cells [3] https://en.wikipedia.org/wiki/Bone_cells [4] http://en.wikipedia.org/wiki/Muscle_cells