3. irregular
Small
shape
When bleeding
from a wound
suddenly occurs,
the platelets gather
at the wound and
attempt to block
the blood flow.
A clot begins to form when
the blood is exposed to air.

6. RED BLOOD CELLS
Carry oxygen. Of the 3 types of blood cells, red blood cells
are the most plentiful. In fact, a healthy adult has about 35
trillion of them. The body creates these cells at a rate of
about 2.4 million a second, and they each have a life span of
about 120 days. Red blood cells are also called erythrocytes.

7. WHITE BLOOD CELL
•Ward off infection. These cells, which come in many shapes
and sizes, are vital to the immune system. When the body is
fighting off infection, it makes them in ever-increasing
numbers. Still, compared to the number of red blood cells in
the body, the number of white blood cells is low. Most
healthy adults have about 700 times as many red blood cells
as white ones. White blood cells are also called leukocytes

9. A capillary is an
extremely
small blood vessel
located
within the tissues of
the body, that
transports
blood from arteries
to veins. Capillaries
are most abundant
in tissues and organs
that are metabolically
active.

10. Capillaries play an important role in microcirculation.
Microcirculation deals with the circulation of
blood from the
to arteries,
to smaller
arterioles,
to capillaries,
to venules, to
veins and back
to the

11.  Their endothelial linings are only one cell thick. These
microvessels, measuring 5-10 μm in diameter, connect
arterioles and venules, and enable the exchange of water,
oxygen, carbon dioxide, and many other nutrients and waste
chemical substances between blood and surrounding tissues.

12. ARTERIES
-Elastic blood vessels that carry blood away from
heart.
-Delivers oxygen and nutrient to the rest of the
bodies.

13. CAPILLARIES in the body
‑Smallest blood vessels
- -Enables the exchange of water, oxygen and carbon
dioxide. Also, other nutrients and waste chemical
substance between blood and surrounding tissues

14. VEINS to the heart
-Carries blood
-Carries deoxygenated blood from tissues to the heart
-Veins are closer to skin that contains valves to keep
blood flowing