8. INTRODUCTION
The average human adult has more than 5 liters of
blood in his/her body.Blood carries O2 and nutrients
to living cells and takes away their waste
products.Through the circulatory system , blood
adapts to the body’s need.
Blood contains liquid plasma and blood cells.Blood
cells are formed in the bone marrow.All blood cells
arise from the same bone marrow stem cells.
The immortal,undifferentiated,pluripotent stem
cellsgive rise to
Erythrocytes(RBCs),Leukocytes(WBCs), and
Platelets.
9. ERYTHROCYTES(RBC)
Also known as red blood cells.
The most numerous type in the blood.
Function to transport of O2 in the blood.
The shape of RBC is ideal for this function
Seen from the top ,RBC appear to be circular,but a side
view shows that they are actually biconcaved discs.
10. This shape increase surface area –to-volume ratio
of the cell,thus increasing the efficiency of diffusion
of O2 & CO2 in and out of the cell.
RBCs also have a flexible plasma membrane
RBCs contain tremendous amount of
haemoglobin,the protein that binds O2.
They have a limited limited life span of about 120
days.
RBCs are produced through a process under
erythropoesis.
12. LEUCOCYTES(WBC)
WBCs protect the body from infection.
They are much fewer in number than red blood
cells, accounting for about 1% of our blood.
The most common WBC is the Neutrophil.
There are several different types of white blood
cells Neutrophil , Eosenophil , Basophil ,
Lymphocyte , Monocyte.
15. PLATELETS
Unlike RBC and WBC , platelets are not actually
cells but rather small fragments of cells .
It helps the blood clotting process or coagulation
by gathering at the site of an injury , sticking to the
lining of the injured blood vessel , and forming a
platform on which blood coagulation can occur
This results in the formation of a fibrin clot , which
covers the wound and prevents blood from leaking
out .
