Circulatory system: Blood vessels Laid end-to-end, an adult's arteries, veins and capillaries would stretch for about 100,000 miles - enough to wrap around the world nearly four times.

Your daily habits impact blood flow more than you realize. Learn how small changes in movement, hydration, and sleep can improve circulation.

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

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 ...

Read discussion of respiratory and circulatory system on pages 96-98. Flow of water over gill runs countercurrent to flow of blood through gill capillaries. When blood first enters the gill, it ...