Blood is composed of cellular components like red blood cells, white blood cells, and platelets suspended in plasma. Red blood cells contain hemoglobin and transport oxygen and carbon dioxide. White blood cells include granulocytes like neutrophils, eosinophils, and basophils and agranulocytes like lymphocytes and monocytes that fight infection. Platelets help form blood clots to stop bleeding. Plasma is mostly water that carries proteins and dissolved substances to tissues. Overall, blood has key functions of transportation, regulation, and protection in the body.

1. :
Composition and
Functions

2. BLOOD….???
• Blood is a fluid connective
tissue derived from
mesoderm.
• It is bright red , slightly
alkaline (pH7.4) and
viscous.
• An average size adult has
about 5l of blood.

3. COMPOSITION OF BLOOD
BLOOD
CELLULAR
RBC WBC PLATELETS
NON-CELLULAR
PLASMA

4. CELLULAR COMPONENTS
RBC/ERYTHROCYTES WBC/LEUCOCYTES
PLATELETS/
THROMBOCYTES

5. • Circular, biconcave, enucleated
• 4-5 million per cubic mm of blood in adult
• Average life span of 120 days.
• Formed in bone marrow &destroyed in liver and spleen.
• The RBCs contain respiratory pigment called hemoglobin.
FUNCTIONS
RBCs transport oxygen from lungs to tissue and
carbon dioxide from tissue to lungs.

6. • Colourless, nucleated & phagocytic cells
• 5000-9000 per cubic mm of blood.
• Average life span of 3-4 days.
• Formed in bone marrow, spleen, lymph nodes, thymus &
payer's patches &destroyed by phagocytosis in blood, liver
&lymph nodes.

7. WBC
GRANULOCYTES
NEUTROPHILS EOSINOPHILS BASOPHILS
AGRANULOCYTES
LYMPHOCYTES MONOCYTES
TYPES

8. GRANULOCYTES
NEUTROPHILS
• Takes Neutral
stain
• 3-5 lobed
nucleus
• Phagocytic in
function
EOSINOPHILS
• Takes Acidic
stain
• Bilobed
nucleus
• Antihistamine
property
BASOPHILS
• Takes Basic
stain
• Twisted
nucleus
• Release
heparin
&histamine

9. AGRANULOCYTES
LYMPHOCYTES
•Large round
nucleus.
•They produce
antibodies
MONOCYTES
•Nucleus is large
kidney shaped
•They are
phagocytic.

10. • Anucleated, round to polygonal& biconvex
• 2.5-4.5 lakhs per cubic mm of blood.
• Average life span of 5-10 days.
FUNCTIONS
• Aggregate at site of injury and form platelet plug.
• Release thromboplastin which helps in clotting of blood.

11. NON-CELLULAR COMPONENT
PLASMA
• Straw coloured, slightly alkaline &viscous fluid.
• 93% water along with other solute 7% protein.
• Plasma proteins are albumin, globulin, fibrinogen & prothrombin.
• All cellular components are suspended in plasma.
FUNCTIONS
• It maintains the viscosity of blood
• Transport dissolved oxygen

12. FUNCTIONS OF
BLOOD
TRANSPORTATION
REGULATION
PROTECTION