In this graph what exactly describes the displacement of curves 1 & 2 (in order)?
A.
Increased Preload & Decreased Contractility
B.
Decreased Preload & increased Contractility
C.
Decreased Preload & Decreased Contractility
D.
Increased Preload & increased Contractility
Show Answer
Correct Answer � D
Explanation
Ans. D. Increased Preload & increased Contractility.
The darker solid lines in the graph represnts normal force-velocity curve.
Curve 1 with upward shift in the curve is due to increased preload & further diaplacement in curve 2 in upward direction is due to increased contractility.
Force-velocity curves are altered when preload or contractility is changed.
When preload is increased, the curve is shifted upward, but V m (the maximal velocity, occurring at zero afterload) is unchanged.
Increased contractility, however, results in a shift in the curve with an increase in Vm.
