精品课程生理学习题库 Gastrointestinal System Instructions: Select the single best answer to the numbered question. Gastrointestinal Smooth vuscle Question 1 In contrast to the situation in skeletal muscle fibers,the resting membrane potential of aany gastrointestinal smooth musele cells has a large contribution from the electrogenicity of the Na+,K+-ATPase. A.The statement is TRUE. B.The statement is FALSE. Question#2 The smooth muscle cells of the circular muscle of the GI tract are electrically coupled gap junctions between neighboring cells. A.The statement is TRUE. B.The statement is FALSE. Which of the folloring statements is FALSE? A.The resting neabrane potential of GI smooth suscle tends to be smaller in magnitude than that of skeletal muscle. B.Action potentials in GI smooth muscle are not blocked by tetrodotoxin. C.LongitudinalGI smooth mscle cells are less well-coupledelectrically than are circular saooth uscle D.Slow waves are generated by GI smooth muscle cells near the inside of the circular muscle layer. E.Contraction of GI smooth muscle cells may occur in the absence of action potentials. Question #4 Which statement about gastrointestinal smooth muscle is NOT correct? A.The cells of the circular layer of gastrointestinal smooth muscle are coupled by numerous gap junctions. B.The length-tension curve of gastrointestinal smooth muscle is broader than that of skeletal muscle C.In human stomach slow waves occur about 3 times per ninute.精品课程生理学习题库 Gastrointestinal System Instructions: Select the single best answer to the numbered question. Gastrointestinal Smooth Muscle Question # 1 In contrast to the situation in skeletal muscle fibers, the resting membrane potential of many gastrointestinal smooth muscle cells has a large contribution from the electrogenicity of the Na+,K+-ATPase. A. The statement is TRUE. B. The statement is FALSE. -------------------------------------------------------------------------------- Question # 2 The smooth muscle cells of the circular muscle of the GI tract are electrically coupled by numerous gap junctions between neighboring cells. A. The statement is TRUE. B. The statement is FALSE. -------------------------------------------------------------------------------- Question # 3 Which of the following statements is FALSE? A. The resting membrane potential of GI smooth muscle tends to be smaller in magnitude than that of skeletal muscle. B. Action potentials in GI smooth muscle are not blocked by tetrodotoxin. C. Longitudinal GI smooth muscle cells are less well-coupled electrically than are circular smooth muscle cells. D. Slow waves are generated by GI smooth muscle cells near the inside of the circular muscle layer. E. Contraction of GI smooth muscle cells may occur in the absence of action potentials. -------------------------------------------------------------------------------- Question # 4 Which statement about gastrointestinal smooth muscle is NOT correct? A. The cells of the circular layer of gastrointestinal smooth muscle are coupled by numerous gap junctions. B. The length-tension curve of gastrointestinal smooth muscle is broader than that of skeletal muscle C. In human stomach slow waves occur about 3 times per minute