Comparing Circulatory Systems in Invertebrates

This video reviews the circulatory systems of earthworms, scorpions, insects and snails, from the heart to the blood vessels.

CHAPTERS
00:00 Introduction
1:08 Earthworm
2:57 Scorpion
5:57 Insects
7:45 Snails
9:43 Conclusion

In order to overcome the limits that diffusion places of body size and shape,. most animals have circulatory systems that allow them to pump a blood-like liquid around their bodies. This allows nutrients, hormones and other essential molecules to be delivered to cells far from the external environment, as well as providing a method for removing waste products.

The structure of a vertebrate circulatory system is very familiar, with a large muscular heart pumping blood into arteries which flow into capillaries and veins. This closed circulatory system, in which blood doesn't leave vessels is replicated in annelid worms, such as earthworms, and some molluscs. But the arrangement of hearts and structure of the blood vessels is very different.

Other invertebrates have an open circulatory system, with a similar heart-type organ that pumps blood into blood vessels. However, these vessels aren't connected and will eventually empty into the body cavity (coelom) where the blood can bathe organs directly.

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[alastairgregory]

This is fascinating :) have you thought about doing a video on how you prepare your slides for imaging?

[CornBit]

Really cool stuff, makes me want a microscope