Coragyps

If anyone still gives a crap (and you really should get a life if you do) about the water-pumping problem: 5 gallons per minute in a 2-inch pipe was too slow for my friction charts. 50 gallons per minute requires 7 horsepower for a 10,000 foot long pipe submerged in Lake Superior or even in Lake Winnepegosis, and it makes absolutely no difference, VZ, whether you are pumping upward or downward. The pipe is submerged. Hydrostatic pressure acts the same inside or outside the pipe. Like it does inside or outside of a fetus.

"Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read." -G. Marx

pz

I really don't care what Vanderzyden's opinion on this matter is anymore, but it is good to know that my intuitive idea of what the answer should be was correct.

Doubting Didymus

I have not started my anatomy strand yet, but from what I remember of secondary biology, aren't the valves in the veins an important factor?

Seeing as the blood can not move in reverse, doesn't the pressure pumped along the arteries automatically create the same amount of 'suction' in the veins, because the blood has nowhere to go but toward the heart?

Asha'man

Hmm, no replies. Does this mean that Vanderzyden finally admitted to himself that he doesn't understand the physics?

pz

No, because blood vessels are leaky and elastic. Blood can pool in swollen vessels and most especially as fluid in the tissues at the lower end of the circuit.

Oolon Colluphid

Which is of course the point of capillaries: to supply oxygen, food etc to tissues, and to collect waste products. They’d have to be watertight to produce suction from one half of the system (arteries) to the other (veins), and then they wouldn’t do their job.

Nice thought though.

DT

Dr Rick

To paraphrase John himself, it's a clear indication that he now completely agrees with us and admits that he was wrong.

Rick

MrDarwin

Not that I especially want to defend him, but he has not posted in any discussion in several days, and posted only 1 or 2 times a day for several days before that. I have to admit I'm somewhat sympathetic as I know how much time this forum can take up, which I myself simply don't have to spare right now.

scigirl

Just wanted to point out to people that Darwin's Terrier = Oolon, and Dr Rick = rbochnermd (in case someone is confused)

Nice name changes btw! I couldn't pronounce either of your names before.

scigirl

Jesus Tap-Dancin' Christ

Ah, so THAT'S where Oolon went.
Dr Rick was easier to notice and figure out.

Oh, scigirl, check out the Hitchhiker's Guide to the Galaxy DVDs for a pronounciation on Oolon.