There are three types of blood vessel: arteries, veins and capillaries. The heart is a muscular organ that pumps blood around your circulatory system. The circulatory system is the heart and all ...

Plasma is 90 per cent water and is the vehicle that everything else rides in as blood courses around the 161,000km of blood vessels that ... bone marrow. The three main types are leukaemia ...

An international group of researchers has identified an important mechanism that enables stem cells to evade immune rejection ...