Reference Article: Facts about the human circulatory system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The circulatory system, also ...

The circulatory system is essential for the ... The total volume of blood in the system is about 5 to 6 litres. The heart pumps approximately 5 litres of blood out every minute.

Your circulatory or cardiovascular system serves a vital function by delivering oxygen and nutrients to all the organs and tissues of your body. Learn more about how the circulatory system works ...

The circulatory system includes the heart ... That means a person's blood vessels could wrap around the planet approximately 2.5 times! Capillaries are tiny, averaging about 8 microns (1/3000 ...

The cardiovascular system consists of the heart, veins, arteries, and capillaries. These components make up two circulatory systems: the systemic and pulmonary circulatory systems. The cardiac ...

Save guides, add subjects and pick up where you left off with your BBC account. Red blood cell Carry oxygen. Contain haemoglobin (rich in iron) to carry oxygen. Biconcave shape to provide a large ...