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Blood has been referred to as “the river of life,” as it flows throughout the circulatory system delivering nutrients, oxygen, and other substances to the cells and transporting waste products away from the cells for elimination. According to information from the Arizona Science Centre, the human vascular system has around 250,000 miles of blood vessels, 95% of which are capillaries, which make up what is called the ‘capillary bed’. The rest are arteries and veins.

Let's look deeper at what is in blood. What do you know already...?

A centrifuged blood sample showing the composition of blood:

Why might some tests require more tubes?

What are some of the tests we perform and why?

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