> As someone who has worked with hydraulic systems I
> am aware of this issue – I did not bring it up
> because I do not want to get too technical.
I was interested enough to have a look at the link you provided to your website. I see a degree in history and politics, jobs in tourism, banking/insurance, teaching ESL, sales, shearing sheep, and running a roadhouse. Nothing wrong with any of that, but I'm curious: on what basis do you claim special technical expertise in hydraulic systems?
> However now you have mentioned it:
> What you are saying is that the heart’s
> hydraulic system would be more efficient because
> it divides the blood flow from the arteries into
> lots of capillaries – rather than pushing the
> blood through 128,000 klms of a single very long
> capillary. This is of course true; and I certainly
> never said the capillaries were joined end to end
> – only that their total length was 128.000
That's a little disingenuous. You referred several times to the blood having to be pushed 128,000 km through an 8-micron tube.
> The problem for your argument is that every time
> you divide the flow in a pressurised pipe you
> divide the pressure; (i.e. if you have 10 psi in a
> pipe and you divide the flow into 2 pipes of equal
> size – you then only have 5 psi in each pipe).
> If you divide the pressure in our arteries into 10
> billion capillaries you are dividing that pressure
> by 10 billion – giving you zero pressure.
Nope. You seem to think that 10 billion individual teeny pipes link the arterioles to the venules. This is incorrect. As I said above, the capillaries form a mesh, an intricate fractal network. There is nothing like 10 billion individual paths that blood must be pushed through. Furthermore, only an estimated 5-10% of the capillary beds are flooded at any given time, controlled by precapillary sphincters that can shut off little local networks while blood is shunted to parts of the system that need it - the digestive system after eating, the muscles during exercise, etc.
> There are other issues concerning volume of
> capillaries as compared to volume of arteries.
> These issues relate to potential pressure in
> capillaries and flow rate etc.. I have not done
> these calculations and do not intend to. For, as
> any sane mechanical engineer will tell you, our
> cardiovascular system is not reliant on pressure
> build-up from the heart.
I don't think any sane mechanical engineer would claim expertise about the cardiovascular system. Or draw a false analogy between a system of rigid pipes and a network of flexible blood vessels. You do realize, don't you, that the elasticity of the vessel walls, muscle action, and even skeletal motion all have an effect on circulation?
Note: you stated above that you would not do the research on OOParts before using them as evidence for your claim. Now you're saying you will not do the maths on your version of the circulatory system before using it as evidence for your claim. It is very hard to take you seriously.