Each 2.54 square centimetre (a square inch) of human skin has six metres (20ft) of blood vessels. Veins hold about 65 per cent of the body's blood and have one-way valves tohelp blood move.

Very low blood pressure. The structure of the blood vessels can be easily compared when they are seen in this cross-section (not to scale).

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 ...

the lymphatic system. Considerable adaptability built into vertebrate circulatory systems: Considerable variation in blood vessels, as seen in shark Due to developmental origin of blood vessels: many ...

Locate the rest of the vessels listed in Table 1 and shown in Figure 5.3. Functional anatomy of circulatory and respiratory system is important. Think carefully about relation between circulation and ...