Which is true about GI muscle contractions?
◦ Cycles of smooth muscle contraction and relaxation are associated with fast wave potentials.
◦ Contractions of the smooth muscle do not depend on calcium.
◦ Phasic contractions last only seconds and occur in the stomach and small intestine.
◦ Tonic contractions are sustained for minutes and occur in the small intestine.
◦ None of these statements are true.