|
so:text
|
The classic view of cardiac anatomy relates to contracting and relaxing, or more specifically, constricting to narrow and eject, and dilating to widen and fill. This sequence was defined by William Harvey. However, the predominant motion of the heart is... rather shortening and narrowing. There are four fundamental motions... narrowing, shortening, lengthening, and widening... a downward twisting of the muscle fibers... shorten and thicken and thereby make the heart eject. This twisting or torsion was described by Borelli, in the 1600s, to simulate the wringing of a rag. ...rogression of contraction into the ascending segment ...results in twisting and thickening in an opposite direction. This sequence is followed by relaxation to allow the ventricle to fill during the remainder of the diastolic phase. ...he heart twists to eject and reciprocally twists to fill in a clockwise and counterclockwise manner... twisting and untwisting of the conical heart muscle in reciprocal directions. ...he predominant action is shortening and lengthening, rather than narrowing and widening... ejection during shortening and suction to fill during lengthening... (en) |
