Sympathetic stimulation of cardiac muscle produces stronger and faster contractions because the concentrations of calcium in the sarcoplasm are reduced by the activity of actively transporting proteins pumping it out of the cell.

Question

Quizplus · Accepted Answer

Sympathetic stimulation of cardiac muscle actually results in an increase in calcium concentration in the sarcoplasm, which leads to stronger and faster contractions. This is due to the activation of calcium channels and increased release of calcium from the sarcoplasmic reticulum.

Sympathetic Stimulation of Cardiac Muscle Produces Stronger and Faster Contractions