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an organism that is isotonic to seawater (equal concentration)-marine organism. In fish, gills play a role in this.
ADH (antidiuretic hormone)
increases reabsorption of water by body and increases salt concentration in urine.
closed circulatory system
circulating fluid is distinct from fluid surrounding cells. Material diffuses between blood vessels and interstitial fluid. Ex's: earthworms, squid, and octopuses
open circulatory system
In insects, other arthropods, and most molluscs-blood bathes directly. There is no direction between blood and interstitial fluid.
What is the process in which water flows over gills and then blood travels to the gills?
What is the structure of hemoglobin?
protein (made up of 4 chains) and Fe (metal that binds oxygen)-up to 4 oxygens.
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