fbpx

๐ŸŸ Earthworm, insect, fish and mammal vascular systems

Diffusion can serve only the smallest of organisms, such as those that are unicellular, in terms of transporting things around the body.

Additional systems must be in place to serve this purpose in larger organisms, and they do so in varied ways.

 

Earthworms have a system similar to mammals as they have vascularisation (blood vessels), and transport gases dissolved in the blood which is pumped by 5 โ€œheartsโ€.

 

Unlike other organisms, theyโ€ฆ well, they have 5 hearts!

 

 

Insects do not carry respiratory gases in the blood, and have an open circulatory system. Their heart is towards the back of the body (dorsal) and has a tube shape.

 

 

An open circulation system means that there is no โ€œbloodโ€ flowing enclosed into vessels. Instead, the heart pumps a fluid which is a mixture of blood contents and interstitial fluid (tissue fluid between cells) throughout the head and body, which then returns to the heart as it relaxes. This fluid is called…

๐Ÿ† Read 500+ topics for all 6 UK exam boards ๐Ÿ†

๐Ÿ“ Enter now to claim your FREE 3-day trial and find answers to all your revision topicsย ๐Ÿ“
โœ”๏ธ Just ยฃ3.49/month after thatย โœ”๏ธ Scholarships & teacher plans availableย โœ”๏ธย Cancel anytime

You explain everything so simply!ย ๐Ÿ™‚ย -SecretDuck on The Student Room
Just a huge thank you for spending your time helping others. I love your site and Iโ€™m seriously very grateful. No word of a lie -Neuron13 on The Student Room
Thank you for making all the content btw!ย -Serena Kutty on YouTube
Good topic notes and cool videos. Iโ€™ll definitely recommend it to my students.ย -Seema Sehgal (AQA Examiner and Biology Teacher) on LinkedIn