1) What is the primary function of the skeletal muscle?  a) Pumping blood b) Digesting food c) Producing body heat d) Facilitating voluntary movement 2) Which of the following activities depends most on anaerobic metabolism? a) Jogging b) Swimming a race c) Sprinting d) Running a marathon 3) The protein that is contained in the thin filament except: a) Myosin b) Actin c) Troponin d) Tropomyosin 4) During exercise, which metabolic process provides energy for muscle contraction in the absence of oxygen? a) Aerobic respiration b) Anaerobic glycolysis c) Krebs cycle d) Electron transport chain 5) Which muscle type is under involuntary control and found in internal organ walls, such as the digestive tract? a) Cardiac muscle b) Striated muscle c) Skeletal muscle d) Smooth muscle 6) Which of the following diagrams is Cardiac Muscle? a) b) c) 7) The first energy source used to regenerate ATP when muscles are extremely active is creatine phosphate. a) True b) False 8) Which of the following occurs within a muscle cell during oxygen deficit? a) Decreased ATP b) Increase ATP c) Decreased Oxygen d) Increase oxygen 9) The sarcoplasmic reticulum stores calcium ions and releases them during muscle contraction. a) True b) False 10) Which of the diagrams shows muscle contract? a) b) 11) In the context of muscle contraction, what is the sliding filament theory? a) The shortening of the H-zone during contraction b) The interaction between actin and myosin filaments c) The breakdown of muscle fibers for energy d) The generation of ATP during oxidative phosphorylation 12) Which muscle below is responsible for the movement of abduction in the shoulder joint? a) b) c) d) 13) Smooth muscles are also known as striated muscles due to their striped appearance under a microscope. a) True b) False 14) The following statements are true about muscle contractions, except: a) Isometric contractions involve changes in muscle length, while isotonic contractions maintain constant muscle tension. b) Skeletal muscles are attached to bones and are responsible for involuntary movements c) Smooth muscles are typically under involuntary control and are found in the walls of internal organs. d) The sliding filament theory explains muscle contraction by the movement of myosin filaments over stationary actin filaments. 15) Muscle contraction is triggered by impulses carried over _________. a) Afferent Neurons b) Motor Neurons c) Myofibril d) Sensory Neurons 16) When elbow flexion, biceps brachii is the ______ or prime mover. Triceps brachii is the _______ a) Synergists, Fixators b) Agonist, Antagonists c) Fixators, synergist d) D. Antagonists, Agonist 17) During muscle contraction, the myosin heads of the thick filament pull on the thin filaments, causing the thin filaments to slide toward the centre of sarcomere. a) True b) False 18) Attached are the details of a muscle fibre. which represents structure A and structure B? a) Skeletal Muscles, Myofibril b) Fascicles, Thick Filament c) Muscle Fibre, Myofibril d) Myofibril , Thick Filament 19) The below statements are true about muscle fiber except: a) Each muscle fiber is covered by a plasma membrane called sarcolemma. b) Each myofibril consists of protein filaments called thin filaments and thick filaments c) The proteins contained in the thin filament contain actin, troponin and tropomyosin d) A darker area, where thick and thin filaments overlap is called 'I band' and a lighter-colored area which contains the rest of the thin filaments is called 'A band'. 20) Cardiac muscle fibres interconnect with one another by irregular transverse thickening of the sarcolemma called Gap Junction. a) True b) False 21) Attached is the structure of cardiac muscle tissue. A is represented for: a) Intercalated Disc b) Striated c) Intermediate Filament d) Gap Junction 22) The muscle responsible for elevating the ribs during passive/normal inspiration is the a) Diaphragm b) Rectus Abdominis c) Sternocleidomastoid d) External Intercostal 23) The inability of a muscle to contract forcefully after prolonged activity is called muscle fatigue. One important factor of muscle fatigue is lowered release of calcium ions from the sarcoplasmic reticulum. a) True b) False 24) Which condition is characterized by a deficiency of dystrophin and progressive muscle weakness? a) Amyotrophic lateral sclerosis (ALS) b) Muscular dystrophy c) Fibromyalgia d) Myasthenia gravis 25) In which condition do muscle fibres contract simultaneously, leading to sustained muscle spasms? a)  Myasthenia gravis b) Tetanus c) Muscular dystrophy d) Fibromyalgia

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