15.What happens to an athlete who depends on anaerobic energy too long? Group of answer choices A.Large muscles will cramp. B.Lactic acid will build up. C.All of the choices are correct. D.Endurance will be limited.

28. The pairs of skeletal muscles are the prime mover and antagonist. A. True B. False ____ 29. Injury to the muscle tendon in front of the tibia is A. rotator cuff injury. B. shin splints. C. muscle atrophy. ____ 30. What is the lubricating substance that is secreted to reduce the friction of joint movement? A. amphiarthoses B. synovial fluid C. bursae

19. Which of the following is true about cardiac muscle? A. It is voluntary and striated B. It is involuntary and striated C. It is voluntary and non-striated D. It is involuntary and non-striated 20. Where does the electrical impulse of the heart start? A) Sinoatrial node B. Atrioventricular node C. Purkinje fiber D. Left bundle branch 21. What is unique about veins? A. They contain a tunica media B. They contain a tunica external C. They contain a tunica interna D. They contain valves 22. Where does gas exchange occur within a vessel?

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