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Alla djur behöver utbyta ämnen med omgivningen

Ex O2, CO2

Olika behov av transportsystem beroende på:

- Djurets storlek


× små djur diffusion


- Växelvarmt/jämnvarmt


× kräver mer ex jämnvarma kräver störst behov av bra O2 tillgång


☆Olika varianter av transportsystem krävs

Utveckling/lösningar


Diffusion


Öppet blodkärlssystem

Ex insekter och kräftdjur

Slutet blodkärlsystem

Blodet rinner i kärl hela tiden

Enkelt kretslopp

- tvårummigt hjärta, blodet passerar hjärtat 1 gång/varv


Ex daggmaskar, fiskar

Dubbelt kretslopp

- fyrarummigt hjärta


- dubbla kretslopp


👉 effektivt

Hjärtat anatomi

- Följ blodets väg


- stora och lilla kretsloppet


- lika mycket blod i lilla kretsloppet som i stora


Kranskärl

Förser hjärtat med O2, glukos mm.

"Hjärtslag"/hjärtkontraktion

Klaffarnas arbete hörs som "hjärtslag"