Small irregular 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.

RED BLOOD CELLSRED BLOOD CELLS

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

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

A capillary is an extremelysmall blood vessel locatedwithin the tissues of the body, that transports blood from arteriesto veins. Capillaries are most abundantin tissues and organs that are metabolically active.

Capillaries play an important role in microcirculation. Microcirculation deals with the circulation ofblood from the

to arteries,to smaller arterioles, to capillaries, to venules, toveins and backto the

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.

ARTERIES

-Elastic blood vessels that carry blood away from heart.

-Delivers oxygen and nutrient to the rest of the bodies.

CAPILLARIES ‑Smallest blood vessels in the body

  -Enables the exchange of water, oxygen and carbon dioxide. Also, other nutrients and waste chemical substance between blood and surrounding tissues

VEINS -Carries blood to the heart

-Carries deoxygenated blood from tissues to the heart

-Veins are closer to skin that contains valves to keep blood flowing