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nares K.Clay's reply
The brain of a sauropod is very small to start with and the requirements
for oxygen and nutrients would be very small in proportion. The pressure
on the nasal passages of the incoming air would be sufficient to pass
the blood back and forth through the blood vessels between the brain and
nasal tissue. The moisture for the surfaces would be as disolved water
from respiration in the lungs thereby keeping the tissues wet. The sinus
cavities within the heads of these animals were huge and I think very
vascular. The blood itself would not flow down the neck as veinous
valves would have retained it in place. As for the waste products I am
not totally sure but I would ponder that they would be excreted through
the skin of the head as in sweat but we know dinosaurs probably didn't
sweat so ti could be some other mechanism.
Carlo