Physiology Source of calcium for smooth muscle contraction A Influx into intracellular store through IP3 receptor Ca2+ channel B Efflux through voltage - gated Ca2+ channel C Efflux through ligand - gated Ca2+ channel D Combination of influx of Ca2+ through voltage - gated, ligand gated Ca2+channel 💡 Explanation Source of calcium for smooth muscle contraction ✓ Correct Answer: D. Combination of influx of Ca2+ through voltage - gated, ligand gated Ca2+channel