What are red blood cells? Whits blood cells? Platelets? I need help!!! I left my homework book at school!!?

Answer 1

Red blood cells, white blood cells and platelets are the cellular components of blood.

Have a look at the wiki pages.

Red blood cells are disc-shaped (biconcave) cells which do not have a nucleus. Their main function is to carry oxygen (bound to haemoglobin) around the body. They are about 7 microns in diameter on average.

White blood cells are a family of nucleated cells in the blood which form a part of our immune system. Some of these cells work by going around and ingesting (engulfing) foreign material. Some work by producing antibodies - proteins that can go and attach to foreign material and signal other immune system components to attack it. Some different types of white blood cells are: Neutrophils, macrophages, lymphocytes (T cells, B cells, helper T cells, Natural Killer cells)

Platelets are small cell fragments arising from Megakaryocytes. They circulate in the blood and help us to form a clot where a blood vessel has been injured. They form a plug of "sticky platelets" (chemical changes near damaged blood vessels change their outside) and they clump together with a mesh of fibrin (made from the coagulation cascade) to form a plug that stops blood from leaking out.

Answer 2

Red blood cells carry oxygen in and carbon dioxide out. White blood cells attack infections. Platelets bind together and plug leaks, like if you cut yourself.

Answer 3

erythrocytes are red blood cells and they are the main transportation of oxygen to the body.

leukocytes are white blood cells that are formed from bone marrow and they are what help fight infections.

Platelets or thrombocytes are in the blood and they are what allow blood to clot, say when you have a cut. in too high concentrations, they cause blood clots in the veins. in too low concentrations, when you get a cut, the blood doesnt clot, and therefore continues to flow.

Answer 4

look it up on the internet. did you try that?