APHY 101 Ivy Tech Exam 4 100% Question and Answers

APHY 101 Ivy Tech Exam 4 100% Question and Answers APHY 101 Ivy Tech Exam 4 100% Question and Answers APHY 101 Ivy Tech Exam 4 100% Question and Answers APHY 101 Ivy Tech Exam 4 100% Question and Answers 1. Find the false statement below, if any, concerning the functions of the muscular system ANS It produces all types of blood cells. 2. What does the word "voluntary" mean, as it pertains to muscle tissue? ANS It means that the muscle tissue contracts in response to the person willing the action to occur. 3. Which of the following sets of characteristics correctly describes smooth muscle tissue? ANS Non-striated, single nucleus in each cell, involuntary, and arranged in layers. 4. Which types of muscle tissue is/are striated? ANS Skeletal and cardiac 5. The striations found in some muscle tissue are the result of ANS The banding pattern of actin and myosin filaments. 6. Perimysium ANS A layer of dense connective tissue that surrounds each fascicle in a skeletal muscle. 7. Tendon ANS A cord of dense connective tissue that connects a muscle to a bone. 8. Troponin ANS One of the proteins that forms a cap over the binding site on actin molecules, preventing crossbridging during muscle relaxation. 9. Sarcolemma ANS The cell membrane of a muscle fiber, which is arranged to allow electrical impulse conduction. 10. T-tubule ANS An organelle that folds inward from the cell membrane, and transmits impulses into a muscle fiber. 11. How is skeletal muscle unique? In other words, how is it different than the other types of muscle tissue? ANS It is the only one that is voluntary. 12. What is the function of the synaptic cleft in a neuromuscular junction? ANS It acts as a gap across which neurotransmitter molecules can travel from the neuron to the muscle fiber. 13. According to the sliding filament theory, what event occurs in each sar- comere that shortens a muscle during muscle contraction? ANS The myosin heads form crossbridges with the actin, and then flip over, pulling the actin. 14. What is the role of Ca+2 in the process of skeletal muscle contraction? ANS It binds to and removes the "cap" from the binding sites on actin, so the myosin can form crossbridges with actin. 15. When a person suddenly begins to exercise, where do the muscles obtain energy for the first few seconds of exercise? ANS ATP reserves 16. What effect does the tetanus toxin (produced by the anaerobic bacteria, clostridium tetani) have on the process of muscle contraction? ANS It causes muscle fibers to contract in the absence of neural stimulation. 17. The period of time, during muscle contraction, during which it can only be stimulated to contract again by a high-intensity stimulus, is called the ANS Relative refractory period 18. Find the false statement below, if any, concerning fast-twitch and slow-twitch skeletal muscle fibers ANS Fast-twitch fibers have a smaller diameter than slow-twitch fibers. 19. What is the most common cause of muscle fatigue? ANS Accumulation of lactic acid, and the resulting decrease in blood pH in the area. 20. Throughout the body, muscles often act in groups. The muscle that acts as the main muscle in a group is called the ANS Prime mover.