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My claim is that gravity is driving the circulation!
...hence the statement that gravity drives circulation. In the case of the heart, let us remember that the heart is not formed first in a developing chick embryo. Circulation is in place before the heart forms. This is called primary circulation. A pulse is observed in simple tubular vessels long before the heart is developed. What then is driving this pulsatile circulation? Clearly it is not the heart!
The early embryonic vascular system permits circulation through a series of incompletely fused and developing channels. Before the heart is fully formed, the flow of circulation is diffuse rather than strongly unidirectional as it is in the atrial and venous systems of later fetal development. Movement of blood through the early embryonic vascular system begins as soon as the primitive heart tubes form and fuse. Contractions of the primitive heart begin early in development, as early as the initial fusion of the endothelial channels that fuse to form the heart.
The embryonic vertebrate heart begins pumping blood long before the development of discernable chambers and valves. At these early stages, the heart tube has been described as a peristaltic pump.
Another point is that a flat bed is used with most patients and people who are healthy. This is not taken into account with all of the other medications, and clearly does not assist varicose veins to return to normal veins.
Comparative Phisiology and BiochemistryChanges in density and viscosity of chicken egg albumen and yolk during incubationDr. Hans-Jürgen Meuer, Christoph EgbersMedizinische Hochschule Hannover, Zentrum Physiologie, D-3000 Hannover 61, Federal Republic of GermanyAbstractIn early stages of avian development, respiratory gas exchange takes place mainly through the blood vessels of the yolk sac membrane. Therefore, a short distance between the yolk sac membrane and the eggshell is required to ensure a sufficient oxygen supply of the embryo. In freshly laid eggs the yolk sphere is located approximately in the center of the egg, but soon after the beginning of incubation it moves to the upper pole right beneath the eggshell. The cause for this displacement is not known. To quantify the forces acting on the yolk sphere of chicken eggs during incubation, we measured the densities of albumen, yolk and subembryonic fluid and the viscosity of the liquid albumen. We found that between day 0 and day 4 of incubation the calculated buoyancy due to density differences between the egg components increases only threefold. This is probably too small to overcome the yield stress of the gel-like thick albumen that forms a capsule around the yolk sphere. A different process responsible for the yolk displacement is proposed. Under reduced gravity, the movements of the yolk are influenced substantially by the fluid properties of the thin albumen, especially yield stress. Furthermore, acceleration peaks present in a space laboratory will probably displace the yolk sphere away from the eggshell. This is strong evidence that an early chick embryo will not be able to survive in a space laboratory in ovo.Received: 21 October 1989; Accepted: 6 December 1989Digital Object Identifier (DOI)10.1002/jez.1402550104 About DOI
Quote from: Andrew K Fletcher on 09/01/2009 15:15:16...hence the statement that gravity drives circulation. In the case of the heart, let us remember that the heart is not formed first in a developing chick embryo. Circulation is in place before the heart forms. This is called primary circulation. A pulse is observed in simple tubular vessels long before the heart is developed. What then is driving this pulsatile circulation? Clearly it is not the heart!I'm tired of reading that argument. As far as I can determine from my online search, embryonic blood circulation begins with the contractions of the primitive heart. Where is the evidence that gravity, not the developing heart, is responsible for pulsatile blood circulation in early embryos? Gravity probably does affect circulation, but the key word is "circulate", for which a pump is required. You only need common sense and a basic understanding of physics to see that.QuoteThe early embryonic vascular system permits circulation through a series of incompletely fused and developing channels. Before the heart is fully formed, the flow of circulation is diffuse rather than strongly unidirectional as it is in the atrial and venous systems of later fetal development. Movement of blood through the early embryonic vascular system begins as soon as the primitive heart tubes form and fuse. Contractions of the primitive heart begin early in development, as early as the initial fusion of the endothelial channels that fuse to form the heart.http://www.bookrags.com/research/vascular-system-embryonic-developme-wap/QuoteThe embryonic vertebrate heart begins pumping blood long before the development of discernable chambers and valves. At these early stages, the heart tube has been described as a peristaltic pump.http://www.sciencemag.org/cgi/content/abstract/312/5774/751
You've been going on about 'gravity driving the circulation' for ages now. Gravity is not a source of energy. Once something has fallen down you need energy from somewhere else to make it go up again. If you use falling salt to cause circulation then you have to get the salt back up again in order to sustain the circulation. This needs energy from somewhere else. In all your experiments YOU lifted the salt up high to provide the energy.
A pulse is observed in simple tubular vessels long before the heart is developed. What then is driving this pulsatile circulation? Clearly it is not the heart!
The lungs, skin, hair, eyes, respiratory tract all evaporate water. So do the leaves of a tree. So we alter the density at the top, this causes it to fall due to the direction of gravity, this causes the more dilute fluids to circulate and tension is applied to the content of the gut or indeed the roots of a tree to pull more water and solutes back in to replace the fluids lost by evaporation and urination in the case of the body.
The lungs, skin, hair, eyes, respiratory tract all evaporate water.
QuoteA pulse is observed in simple tubular vessels long before the heart is developed. What then is driving this pulsatile circulation? Clearly it is not the heart!But a gravity driven circulation system would have no pulse.QuoteThe lungs, skin, hair, eyes, respiratory tract all evaporate water. So do the leaves of a tree. So we alter the density at the top, this causes it to fall due to the direction of gravity, this causes the more dilute fluids to circulate and tension is applied to the content of the gut or indeed the roots of a tree to pull more water and solutes back in to replace the fluids lost by evaporation and urination in the case of the body.But the vascular system in a tree is not a closed loop. Also, the kidneys and small intestine alter blood density far more than the lungs, so wouldn't this imply that we would have circulation only as far as the kidneys?And another point - the circulation in an adult with varicose veins is hardly comparable to that of a developing chick foetus - you cannot escape the fact that there is a bloodly great pump in the system. Have you ever compared the rate of solute flow downwards with gravity against the rate of flow in any direction from the heart? I haven't, so would be interested to hear how it works out - I suspect the heart vastly overpowers gravity.
QuoteThe lungs, skin, hair, eyes, respiratory tract all evaporate water.So if you stood on your head, it would work the other way round?Why do we bother to have a heart if we could just use your system? How much energy does your evaporation system generate? Have you done the sums? How much energy is needed to drive the blood around the system? Does your proposed mechanism produce enough? Without some numerical evidence, your proposed idea is just not Science. (I think I've mentioned this to you before)
What surprises me most is the simple fact that VV are caused by a breakdown of the very structures inside our veins that fight gravity.
The heart rate decreases by 10-12 beats per minute on IBT. Yet circulation is improved. So if the heart beats less and circulation increases how do you account for that?