None. Your blood and the circulatory system is internal. Clothing is external, barring accidents the two have no contact.
Microci
the heart
The respiratory and circulatory systems are involved in the exchange of gases between the alveoli and blood. The alveoli are part of the lungs, and their surrounding capillaries are part of the circulatory system.
The lymphatic system is not directly involved in the systematic circulation of blood. While it plays a role in immune function and fluid balance, it is a separate system from the cardiovascular system responsible for circulating blood throughout the body.
Iron found as part of hemoglobin which comprises most of each red blood cell (RBC).
The blood coagulation which you are referring to has several stages and types. The main cells involved directly are thrombocytes, while endothelial cells etc may also play a role. There are also soluble factors of the blood involved. (see coagulation cascase) See http://en.wikipedia.org/wiki/Coagulation
it produces the hormones involved in the development of white blood cells called Tcells which form part of the immune system.
The spleen is not directly involved in memory. It is a part of the immune system and is responsible for filtering blood and producing antibodies, rather than being directly involved in memory processing.
The spleen is a structure that is not involved in the production or delivery of gametes. It is part of the lymphatic system and plays a role in filtering blood, storing red blood cells, and helping the immune system fight infections.
I think you are asking what causes blood on clothing. Usually, it is caused by a cut or a wound, and the blood gets onto the clothing accidentally. Most people who get a cut will notice if it is bleeding and will put a bandage on it; sometimes, they do not notice in time, and the clothing gets a stain on it. In the event that you do get blood on an article of clothing, there are special products you can buy in the store that will remove stains, and some of these products are good at removing blood.
No. They are a part of clothing or clothes. They are not usually located with the shirts and pants in clothing departments at stores.
Your veins is more important if you got a cut Platelets. These are the cells involved in the clotting of blood at the site of a cut. Without platelets after cutting yourself you would exsanguinate.