Experiments into effects of pressure on animals are hard to do and intensive studies are underway. Hypoxia - Possible solutions for extending time below water. O2 consumption dec metabolic rate Aquatic respiration Cutan frogs and sea snakes Esophageal or rectal respiration Breathing water. Ox storage - lungs bad idea Inc blood volume and conc of rbcs. Cant have too much RBCS cuz of inc visc.
Seal is weight of man but has a total blood volume as great.
The second largest amt of O2 is stored in the muscle mass. Seal and whale muscle has a higher myoglobin content. Circ changes - diving reflex. Vasoconst of periphery Dec heart rate. Blood to vital organs only.