Blood ppt
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Transcript of Blood ppt
BloodBlood Fluid that circulates through the
heart, arteries, capillaries, and veins;
chief means of transport within the body
the average human has 5 litres of blood
it is a transporting fluid
it carries vital substances to all parts of the body
BloodBlood
COMPONENTS OF BLOOD
Blood Is Composed Of Two Parts 1.Plasma 2.Cellular Components -RBC -WBC -Platelets
plasmaplasma
The blood consists of a suspension of special cells in a liquid called plasma. In an adult man, the blood is about 1/12th of the body weight and this corresponds to 5-6 litres. Blood consists of 55 % plasma, and 45 % by cells called formed elements.
Cells in Blood
•Erythrocytes (Red blood cells)
•Leukocytes (White blood cells)
•Thrombocytes (Platelets)
Erythrocytes
• 7.5 micron diameter
• No nucleus or organelles;
lots of hemoglobin
• Biconcave disc
• large surface to volume
ratio: efficient gas
exchange
• The erythrocytes are the most numerous blood cells i.e. about 4-6 millions/mm3.
• They are also called red cells. In man and in all mammals, erythrocytes are devoid of a nucleus and have the shape of a biconcave lens. In the other vertebrates (e.g. fishes, amphibians, reptilians and birds), they have a nucleus.
• The red cells are rich in hemoglobin, a protein able to bind in a faint manner to oxygen. Hence, these cells are responsible for providing oxygen to tissues.
the bodies “defence” part of the immune
system much larger than RBCs have a nucleus 4000-13000 per mm3
White blood cellsLeukocytes
GranulocytesGranulocytes neutrophils neutrophils
260 - 70% of circulating leukocytes
• Nucleus: 2-5 lobes ,dia –12-15 micro meter
•Have horshoe shoe shaped or band shaped nucleus called as band cells
• cytoplasm is transparent and its granules are pink coloured
Eosinophills
• 2-4% of circulating leukocytes
• Bilobed nucleus
•defense against parasites; modulation of inflammatory processes
• eosinophilic specific granules containing:
• major basic protein (toxic to parasitic larvae),
• lysosomal enzymes, peroxidase, histaminase
BasophillsBasophills
• < 1 % of circulating leukocytes
• Nucleus irregular lobes
•Dia-9-10 micro meter
Agranulocytes
Lymphocytes
• ~30 % of circulating leukocytes
• Round, densely stained nucleus; little cytoplasm
•Dia-8-10 micro meter
monocytes
• 5 % of circulating leukocytes
• indented folded nucleus
Fig. 12-18
•Opaque, slightly basophilic cytoplasm;
•fine azurophilic granules
•Dia-8-10 micro meter
Thrombocytes(platelets)
• They are small sized diskettes about 3 micro meter in diameter
• Cell Fragments produced of megakaryocytes
• no nucleus• Numerous cytoplasmic organelles• promote blood clotting, help
repair gaps in blood vessel walls