Summary AQA ALEVEL BIOLOGY ON WHITE BLOOD CELLS

White Blood Cells
=

If fail the
-
the
physical or chemical barriers , next line of defence are white blood cells .




'

Kember in humans ,
our blood is made of :
,




blood cells Oz )
↳ Red ( contains
hemoglobin which carries

↳ white blood cells ( see below
)
↳ platelets ttrevents bleeding by forming dots
↳ Plasma lliquid that carries blood cells and proteins)
white blood cells also leukocytes
called they protect
'


are -




illness disease
against and .



you
-
White blood cells are made in the bone marrow and are


the blood and tissues
stored in
lymph
.




Types of white Blood cells

, deer - -
r - or #

1 .

Monocytes -


they have a
longer lifespan than
many
white

blood cells and to break down bacteria
help .




2- Neutrophils -
kill and
digest bacteria and fungi through phagocytosis .

They are


the most of white blood cell
numerous
type .




3 .

Basophils -
Sounds an alarm when infectious agents invade
your
blood .
They secrete chemicals

such histamine marker of allergic disease that help c.ontrol the
body 's immune
as ,
a ,

system .




kill
4 .

Eosinophils -

They attack and parasites and , cancer cells ,
and help with
allergic responses .




5.
Lymphocytes
-
create antibodies to
fight against bacteria ,
viruses and other
potentially
harmful invaders .




What is a
phagocyte ?

A of out
phagocyte
is type white blood cell that carries
phagocytosis
✓
a .




found blood and in first
Phagocytes are in the tissues and are the cells
.




to
respond to an immune system trigger inside a
body .




Different types of Phagocytes

Macrophages
}
1
come from
.




cells
monocytes
2 .
Dendritic

3. Neutrophils


Macrophages cells involved in the detection phagocytosis and
'


are ,




destruction of bacteria and other harmful organisms .




Dendritic main function material and
cell 's is to
process antigen
-




present it on the cell surface to the

of the
T
lymphocytes immune
system
-
.