of the slow waves C.Circular uscle couped electrically and have numerous kap junctions D.Calcium that enters during an action potential participates in excitation-contraction coupling. E Contractions do not occur in the absence of action potentials. Question 9 Which of the following statements is NoT true? AGI smooth suscle may contract in the absence of action potentials B.Nerves and hormones can influence the frequency and amplitude of slow waves. C.The electrogenicity of the Na,K-ATPase contributes significantly to the resting potential in GI smooth muscle. D.Slow waves are generated in neurons of the myenteric plexus. 1.A2.A3.D4.E5.B6.D7.E8.E9. Gastric Motility Question 1 Gastric smooth scle may contract in response to the depolarizing phase of the slow wave even wher action potentials do not occur at the peak of the. A.The statement is TRU B.The statenent is FALSE Question#2 Indigestible particles that are several millimeters in diameter tend to remain in the stomch betwee meals and are emptied when the following meal stimlates gastric contractions. A The statement is TRUE B.The statenent is FALSE Question #3 Gastric contractions begin in mid-body and appear to travel toward the pylorus,growing in strength as they travel A The stateaent is TRUE. B.The statement is FALSEof the slow waves. C. Circular muscle cells are well coupled electrically and have numerous gap junctions. D. Calcium that enters during an action potential participates in excitation-contraction coupling. E. Contractions do not occur in the absence of action potentials. -------------------------------------------------------------------------------- Question # 9 Which of the following statements is NOT true? A. GI smooth muscle may contract in the absence of action potentials. B. Nerves and hormones can influence the frequency and amplitude of slow waves. C. The electrogenicity of the Na,K-ATPase contributes significantly to the resting potential in GI smooth muscle. D. Slow waves are generated in neurons of the myenteric plexus. --------------------------------------------------------------------------------- Answer： 1.A 2.A 3.D 4.E 5.B 6.D 7.E 8.E 9.D Gastric Motility Question # 1 Gastric smooth muscle may contract in response to the depolarizing phase of the slow wave even when action potentials do not occur at the peak of the slow wave. A. The statement is TRUE. B. The statement is FALSE. -------------------------------------------------------------------------------- Question # 2 Indigestible particles that are several millimeters in diameter tend to remain in the stomach between meals and are emptied when the following meal stimulates gastric contractions. A. The statement is TRUE. B. The statement is FALSE. -------------------------------------------------------------------------------- Question # 3 Gastric contractions begin in mid-body and appear to travel toward the pylorus, growing in strength as they travel. A. The statement is TRUE. B. The statement is FALSE. --------------------------------------------------------------------------------