open circulatory systems
fluid (hemolymph) transported leaves the vessels into cavities. only nutrients diffuse into cells through this system (no gases), ostia draw fluid back into pumps so it can be pumped again, there are no veins, common in invertebrates, very energy efficient, doubles as a HYDROSKELETON
terms of location
anterior (head), posterior (bum), dorsal (back), ventral (belly)
closed circulatory system
blood is contained in veins, blood is not interstitial fluid, blood goes through aortic arches only once (one or more loops), diffusion of gases is facilitated by the shape of the animal and transported through blood. they have two large blood vessels, branch out smaller and smaller, more complex behavior= more complex circulatory system, advantage is that you can direct things in certain places, much better at transporting fluids, supports high metabolic processes
double loop circulatory system vs single loop adv.
double loop separates blood from oxygen rich to oxygen poor which makes it more efficient. all parts of the body receive oxygen rich blood. the two chambers either receive or distribute blood. more oxygen travels around body.
anterior, posterior, dorsal and ventral
in medical terms, anterior= superior
double loop, single loop
single loop: fish and their relatives,
double loop: higher vertabrates such as mammals, birds etc.)
unicellular organism transport
wastes and nutrients diffuse into cell