MSF Exam 1 – Practice Test Questions And Answers Verified 100% Correct

MSF Exam 1 – Practice Test Questions And Answers Verified 100% Correct c. Skeletal muscle Which of these effectors is not directly controlled by the ANS? a. Smooth muscle b. Cardiac muscle c. Skeletal muscle d. Most glands B. dilation of the pupils Which of the following is not a result of parasympathetic stimulation? A. salivation B. dilation of the pupils C. increased peristalsis of the digestive tract D. elimination of urine Craniosacral region The site of origin of the preganglionic fibers of the parasympathetic nervous system is the _____. a. Thoracolumbar region of the spinal cord b. Higher brain centers c. Sympathetic chain d. Craniosacral region b. NE and epinephrine are secreted into the blood as part of the sympathetic response Sympathetic responses generally are widespread because _____. a. Inactivation of Ach is fairly slow b. NE and epinephrine are secreted into the blood as part of the sympathetic response C. Preganglionic fibers are short D. Preganglionic fibers are long A. Occurs down an electrochemical gradient Which of the following characteristics is shared by simple and facilitated diffusion of glucose? A. Occurs down an electrochemical gradient B. Saturable C. Requires metabolic energy D. Inhibited by the presence of galactose E. Requires a sodium gradient There is net inward current and the cell interior becomes less negative During the upstroke of the nerve action potential: A. There is net outward current and the cell interior becomes more negative B. There is net outward current and the cell interior becomes less negative C. There is net inward current and the cell interior becomes more negative D. There is net inward current and the cell interior becomes less negative B. Uptake of calcium into the presynaptic terminal, release of acetylcholine, depolarization of the muscle end plate The correct temporal sequence for events at the neuromuscular junction is: A. Action potential in the motor nerve, depolarization of the muscle end plate, uptake of calcium into the presynaptic nerve terminal B. Uptake of calcium into the presynaptic terminal, release of acetylcholine, depolarization of the muscle end plate C. Release of acetylcholine, action potential in the motor nerve, action potential in the muscle D. Uptake of calcium into the motor end plate, action potential in the motor end plate, action potential in the muscle E. Release of acetylcholine, action potential in the muscle end plate, action potential in the muscle D. Myelinating the nerve The velocity of conduction of action potentials along a nerve will be increased by: A. Stimulating the sodium-potassium pump B. Inhibiting the sodium-potassium pump C. Decreasing the diameter of the nerve D. Myelinating the nerve E. Lengthening the nerve fiber A. Decrease the rate of rise of the upstroke of the action potential A newly developed local anesthetic blocks sodium channels in nerves. Which of the following effects on the action potential would it be expected to produce? A. Decrease the rate of rise of the upstroke of the action potential B. Shorten the absolute refractory period C. Abolish the hyperpolarizing afterpotential D. Increase the sodium equilibrium potential E. Decrease the sodium equilibrium potential B. Titin Which of the following cytoskeletal components anchor thick filaments to Z disk? A. Nebulin B. Titin C. Dystrophin D. Alpha-actinin E. Myosin C. Action potential in muscle membrane, depolarization along T tubules, intracellular calcium concentration rises after being released from the SR, calcium binds troponin C, exposure of myosin binding site on actin, formation of cross-linkages between thin and thick filaments, power stroke producing contraction Which of the following sequences is the correct order of excitation-contraction coupling in skeletal muscle? A. Action potential in muscle membrane, depolarization along T tubules, power stroke producing contraction, intracellular calcium concentration increased after release from the SR, calcium binds to troponin C, formation of cross-linkages between thin and thick filaments B. Calcium binds troponin C, depolarization along T tubules, action potential in muscle membrane, exposure of myosin binding site on actin, formation of cross linkages between thin and thick filaments, power stroke producing contraction C. Action potential in muscle membrane, depolarization along T tubules, intracellular calcium concentration rises after being released from the SR, calcium binds troponin C, exposure of myosin binding site on actin, formation of cross-linkages between thin and thick filaments, power stroke producing contraction