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Unformatted text preview: ID: A 1 114 Midterm 1 (03) True/False (1POINT EACH) Mark A for TRUE, mark B for FALSE. ____ 1. The sympathetic and parasympathetic nervous systems exert opposing effects in all parts of the gastrointestinal tract ____ 2. Slow waves may travel between adjacent muscle cells via gap junctions ____ 3. One of the responses to α-adrenergic stimulation of the GI tract is an increase in blood flow in the gut ____ 4. Smooth muscle contains less thick filaments and more thin filaments compared to skeletal muscle. ____ 5. The stomach does not possesses storage capabilities ____ 6. ICCs found within the layers of the circular muscle are called ICCs of the deep muscle plexus. ____ 7. Vagal and spinal afferents only adapt slowly. ____ 8. The processes of orienting the myosin head into the energized state is called the powerstroke. Multiple Choice (4 POINTS EACH) Identify the letter of the choice that best completes the statement or answers the question. ____ 9. Which of the following statements regarding slow waves is FALSE ? a. They exhibit an upstroke (depolarization) followed by a plateau b. They are generated by intrinsic nerves c. Their activity is spontaneous and does not require external stimuli to occur d. They are sometimes called the pacemaker potential e. Smooth muscle contraction typically occurs during the plateau portion of the slow wave ____ 10. You isolated a single nerve fiber that innervates the GI tract and performed a few tests on the nerve. You discovered that the nerve's cell body resides in the spinal cord and that stimulation of it decreased GI activity. What is this nerve and what neurotransmitter is released at the target? a. Preganglionic parasympathetic neuron, acetylcholine b. Inhibitory intrinsic motor neuron, VIP c. Postganglionic parasympathetic neuron, VIP d. Preganglionic sympathetic neuron, acetylcholine e. Postganglionic sympathetic neuron, norepinephrine ID: A 2 ____ 11. Which of the following are regions of the mucosa? a. Myenteric plexus b. Lamina propria c. Muscularis mucosa d. Two of the above are correct answers for this question e. All of the above are correct answers ____ 12. Which of the following statements is TRUE? a. Smooth muscle contraction requires troponin interaction with Ca 2+ b. Motor-neurons innervate every muscle cell in skeletal but not smooth muscle c. Smooth muscle cells lack myosin d. Contractile fibers are always structurally organized parallel to the short axis of smooth muscle cells. e. Both skeletal and smooth muscle are multinucleated. ____ 13. Activity in which of the following neurons ALWAYS results in inhibition of GI smooth muscle? a. Postganglionic sympathetic neuron b. Inhibitory interneuron c. IPAN d. Enteric motor neuron e. Two of the above are correct answers to this question ____ 14. A bolus in the GI lumen can induce peristalsis by activating......
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- Spring '08
- a. b. c., b. c. d., B E D B B D C B D