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Single and double, open and closed circulatory systems
A single circulatory system means that blood only flows through the heart once in a cycle

In a double circulatory system, blood flows from the heart to the lungs, then back to the heart
and onto the body. This is much more…

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Endothelium is a smooth layer of cells that lines all blood vessels to reduce the friction of the
blood flow.
Smooth muscle can contract to make the lumen size smaller or relax to increase it.
Elastic fibres allow arteries to withstand high pressures by stretching and then recoiling.
Collagen fibres…


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