Lecture 32 � Circulation I

Lecture 32 � Circulation I - Lecture 32 Circulation...

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Lecture 32 – Circulation I To supply with oxygen and get rid of CO 2 A. Protozoans (simple diffusion) and simple multicellular animals a) Sponges - simple diffusion b) Cnidarians (fig. 43.1) – gastrovascular cavity, but no respiratory, simple diffusion c) Ctenophores - gastrovascular cavity, but no respiratory, simple diffusion d) Flatworms (fig. 43-1) - gastrovascular cavity, but no respiratory, simple diffusion e) Nematodes – have a tube-within-a-tube, but no respiratory, simple diffusion B. Open and closed circulatory systems 1. Circulatory system a) Pumping organ – such as a heart b) Blood or hemolymph – hemolymph is in open – hemolymph is mixed with interstitial fluids (oxygenated and deoxygenated blood mix), blood is in closed - we can tell the difference between blood and interstitial fluid because they are kept separate; c) Blood vessels or spaces – spaces called hemoceols are in open circulatory systems 2. Open circulatory systems a) Arthropods (fig. 43.2) b) Mollusks (clams, snails)
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Lecture 32 � Circulation I - Lecture 32 Circulation...

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