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F06#2 - BS300 Exam 2C Fall 2006 Nervous Name S.ED 1 The...

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BS300 Name _ Exam 2C Fall 2006 S.ED# Nervous 1. The ATPase that moves vesicles from the cell body down the axon in axoplasmic transport is: a. myosin. b. dynein. /cl kmesin. \=ztr d. actin. e. microtubules. 2. Membrane proteins synthesized in the neuronal cell body are transported toward the axon terminal on cytoskeletal structures called: 3. In the reflex arc for the patellar tendon tap, primary sensory afferents sensitive to stretch synapse directly onto: /fe/'a and b are iVy Muscle 4. The transverse tubules (t-tubules) in skeletal muscle: a. releases calcium into the sarcoplasm to initiate muscle contraction. J . pumps calcium from the sarcoplasm to cause the muscle to relax, conducts action potentials to the sarcoplasmic reticuTum. cl. binds acetylcholine. e. a and b are correct. 5. The role ofCa^ + in muscle contraction in skeletal muscle is to: a. act as an ATPase. b. bind to myosin. c. bind to actin filaments. P&. bind to troponin and move tropomyosin off of the myosin binding sites on actin. e. bind tropomyosin to move troponin off of the myosin binding sites on actin. 6. The increase in positive charge in a muscle fiber at the neuromuscular junction first occurs when: a. Sodium channels sensitive to the increases in positive charge open. b. Potassium channels sensitive to increases in positive charge open, /c^ Receptors sensitive to acetylcholine open and admit sodium. Calcium channels sensitive to the action potential release calcium from the sarcoplasmic reticulum. e. Acetylcholine receptors sensitive to the increase in intracellular positive charge open.
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BS300 Exam 2 October 11, 2006 7. Muscle relaxation normally occurs because: 8. In skeletal muscle, the sarcoplasmic reticulum serves to: a. release calcium into the sarcoplasm to initiate muscle contraction. b. pump calcium from the sarcoplasm to cause the muscle to relax. c. conduct action potentials into the middle of the muscle. d. open voltage-gated channels in the sarcolemma. /e. a) and b are correct.
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