Muscle contractions have increased force at slower shortening velocities compared to higher shortening velocities.
The force generated by heart muscle cells can vary depending on a number of variables.
The active force produced by the muscle increases to its maximal length before decreasing. The length at which this highest point is reached The force rises as the stimulus frequency rises until the maximum is reached, at which time it starts to fall.
The sympathetic nervous system's circulating levels of epinephrine and norepinephrine increase along with the force of contraction. These elements can work together to enable the heart to produce greater force as needed. the heart beats regularly.
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