Modestly Increasing the Frequency of the Heart Beat from 70

Multiple Choice

Modestly increasing the frequency of the heart beat from 70 min^-1 to 120 min^-1 will

A) Increase the strength of contraction by increasing the size of the Ca²⁺ transient
B) Decrease the strength of contraction due to fatigue
C) Increase the strength of contraction by initiating contraction before the heart has completely relaxed
D) Increase the strength of contraction by stretching the m yofilaments
E) Increase the strength of contraction by inhibiting NCX