Essentials Of Strength Training And Conditioning Chapter 1 Study Guide Questions And Correct Answers

Myofibrils {Ans: Contain the apparatus that contracts the muscle cell, located in the sarcoplasm}Left and right bundle branch and the Purkinje fibers {Ans: Conduct impulses to all parts of the ventricles}Tachycardia {Ans: More than 100 beats per minute}Muscle fibers {Ans: (Muscle cells) Long cylindrical cells containing many nuclei}Diastole {Ans: Ventricular relaxation}Type IIa vs Type IIx {Ans: have greater capacity for aerobic metabolism and more capillaries surrounding than than type IIx and therefore show greater resistance to fatigue}Venous system {Ans: returns blood toward the heart, low pressure}Myocardium {Ans: Heart muscles}The two myofilaments {Ans: Myosin and actin. Organized longitudinally in the sarcomere}Z-line {Ans: Located in the middle of the I-band and papers as a thin dark line, actin filaments are anchored here, z-lines repeat through the entire myofibril}Uniaxial joints {Ans: (Elbow) operate as hinges, rotating about only one axis}Repolarization {Ans: The electrical potential generated as the ventricles recover from the state of depolarization}I-Band {Ans: Corresponds with the areas in two adjacent sarcomeres that contain only actin filaments}Veins {Ans: Transport blood back to the heart. contain one-way valves that help maintain venous return by preventing retrograde blood flow}Pleural pressure