Circulatory Systems. Exchange of materials. Animal cells exchange material across their cell membrane fuels for energy nutrients oxygen waste (urea, CO 2 ) If you are a 1-cell organism that’s easy! diffusion If you are many-celled that’s harder. CO 2. CO 2. O 2. NH 3. aa. NH 3.
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closed system = higher pressures
high pressure & high O2to body
low pressureto body
low O2to body
What’s the adaptive value of a 4 chamber heart?
4 chamber heart is double pump = separates oxygen-rich & oxygen-poor blood; maintains high pressure
birds & mammals
Fluid & solutes flows out of capillaries to tissues due to blood pressure
Interstitial fluid flows back into capillaries due to osmosis
BP > OP
BP < OP
85% fluid returns to capillaries
15% fluid returns via lymph
to neck & head& arms