8. Red Blood Cells
- contain hemoglobin, a
molecule specially
designed to hold oxygen
and carry it to cells that
need it.
- can change shape to an
amazing extent, without
breaking, as it squeezes
single file through the
capillaries.
- a biconcave disc
that is round and
flat without a
nucleus
9. White Blood Cells
There are many different types and
all contain a big nucleus.
The two main types are the
lymphocytes and the macrophages.
Some lymphocytes fight disease by making antibodies to destroy
invaders by dissolving them.
other lymphocytes make antitoxins to break down poisons.
Macrophages ‘eat’ and digest micro-
organisms .
10. Plasma
A yellow-colored
liquid that carries
the cells and the
platelets which
help blood clot.
• carbon dioxide
• glucose
• amino acids
• proteins
• minerals
• vitamins
• hormones
• waste materials
like urea.
It also contains
useful things like:
11. Platelets
Platelets are bits of cell
broken off larger cells.
Platelets produce
tiny fibrinogen
fibers to form a
net. This net
traps other blood
cells to form a
blood clot.
12. The Heart
ARTERIES -
carry blood
away from
the heart
Now let’s look inside the HEART…
VEINS –
bring blood
toward the
heart
15. How does the Heart work? (9 steps)
STEP ONE Deoxygenated blood
from body travels through VENA
CAVA to the heart
Vena Cava is
the largest vein
in the body.
16. blood from the
body
• The heartbeat
begins when the heart
muscles relax and
blood flows into the
atria.
• Both atria fill with
blood at the same
time.
STEP TWO Right Atrium
Remember: Blue NO oxygen Red has oxygen
17. • The atria then
contract and the
valves open to
allow blood into
the ventricles.
• Both ventricles
fill with blood at
the same time.
STEP THREE Right Ventricle
18. The valves close to stop
blood flowing
backwards.
The ventricles contract
forcing the blood to
leave the heart and go
to the lungs.
At the same time, the
atria relax and fill
with blood.
STEP FOUR Lungs
19. STEP FIVE Blood picks up
oxygen
Gas exchange occurs
in the lungs where
blood picks up oxygen.
20. blood from
the body
blood from
the lungs
• The heart beat begins
when the heart muscles
relax and blood flows
into the atria.
• Both atria fill with
blood at the same time.
STEP SIX Left Atrium
Blood now has OXYGEN
Remember: Blue NO oxygen Red has oxygen
21. The left ventricle
is the strongest
chamber in the
heart because it
has to pump
blood to the
whole body.
STEP SEVEN Left Ventricle
22. STEP EIGHT Oxygenated
blood travels from heart
through AORTA
• Aorta transports
oxygenated blood to
all parts of the
body.
• Aorta is the
largest artery in
the body.
23. STEP NINE
Blood travels
through
body to
organs and
drops off
oxygen.
24. Lungs
Body cells
Our circulatory system is a double circulatory
system.
This means it has two parts parts.
the right side
of the system
deals with
deoxygenated
blood.
the left side
of the
system
deals with
oxygenated
blood.
