PSIO 201 Example questions for exam 3 REVISED The following questions are intended to give students a general idea of the type of questions they will see on the exam. These questions do not cover all of the material that students need to know for the exam. All questions are multiple choice; select the single best answer for each question 1. In a second class level A. the effort is between the load and the fulcrum B. the fulcrum is between the load and the effort C. the load is between the fulcrum and the effort D. there is no fulcrum E. the load is always equal to the effort 2. During arm abduction, the latissimus dorsi is considered a(n) A. agonist because it abducts the arm B. synergist because it adducts the arm C. antagonist because it adducts the arm D. fixator because it adducts the arm 3. Nodding your head “yes” involves: A. flexion of the head at a first class lever B. extension of the head at a second class lever C. flexion of the head at a second class lever D. extension of the head at a third class lever E. flexion of the head at a third class lever 4. ATP A. Binds to the myosin head and causes detachment of myosin from actin B. Is needed to release calcium from the sarcoplasmic reticulum during excitation contraction coupling C. Binds to troponin and causes tropomyosin to shift position to expose the binding sites on actin D. Is not needed for muscle relaxation 5. The muscle twitch A. is the primary mechanism of contraction in cardiac muscle B. duration is longer in slow twitch fibers compared to fast twitch fibers C. contains a latent period in which the muscle does not produce tension D. all of the above are true 6. The type of contraction in which the muscle fibers generate tension while they lengthen is called A. tetanic B. concentric C. eccentric D. isometric E. isokinetic 7. The conduction of electrical signals toward the interior of a muscle fiber is aided by the presence of ______________ along the sarcolemma. A. myofibrils B. sarcoplasmic reticulum C. protein filaments D. T-tubules E. holesPSIO 201 8. Which of the following supports the sliding filament theory of muscle contraction? A. the A band decreases in width during concentric contraction B. the I band increases in width during concentric contraction C. the distance between the Z-lines decreases during concentric contraction D. the A band increases in width during concentric contraction E. the distance between the Z-lines increases during concentric contraction 9. In the contraction cycle, which of the following occurs immediately after ATP binds to the myosin head? A. the myosin head pivots toward the center of the sarcomere B. the binding site on actin is exposed C. the myosin head is recocked D. the myosin head detaches from actin E. ATP is hydrolyzed 10. Which of the following acts as an ATPase during the contraction cycle of skeletal muscle? A. actin B. creatine phosphate C. the motor unit D. the myosin head groups E. the Z-disc 11. Cardiac muscle tissue is characterized by all of these EXCEPT: A) long, multinucleated, cylindrical cells B) intercalated discs C) numerous large mitochondria D) striations 12. Smooth muscle A) is largely under voluntary control. B) is located in the coverings of solid organs. C) is striated. D) moves blood through the heart E) is regulated by the autonomic division of the nervous system. 13. In a concentric contraction A) the load is greater than the effort B) the effort is greater than the load C) the load and the effort and equal D) all of the above are true 14. Aerobic metabolism A) converts the fatty acids into ATP. B) occurs in the mitochondria. C) requires O2, which can be obtained from hemoglobin or myoglobin. D) is required for muscle activities lasting longer than one minute. E) All of these are correct. Key: 1C, 2C, 3A, 4A, 5D, 6C, 7D, 8C, 9D, 10D, 11A, 12E, 13B,