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5.3 Muscle Energetics & Types — Test 1
Q1. The muscle that is under involuntary control is:✓ Smooth muscle
Q2. Skeletal muscles are correctly described as:✓ Striated and voluntary
Q3. Athletes get muscle cramps mainly due to:✓ Accumulation of lactic acid (and salt/fluid imbalance)
Q4. The excess oxygen consumed after vigorous exercise (oxygen debt) is used mainly to:✓ Remove accumulated lactic acid and restore energy stores
Q5. In an isotonic muscle contraction, the muscle:✓ Shortens while the tension stays roughly constant
Q6. In an isometric muscle contraction, the muscle:✓ Develops tension without changing length
Q7. The immediate energy source for muscle contraction, regenerated quickly from creatine phosphate, is:✓ ATP
Q8. A single brief contraction of a muscle in response to a single stimulus is called a:✓ Twitch
Q9. A sustained, maximal contraction produced by rapidly repeated stimuli is called:✓ Tetanus (tetanic contraction)
Q10. Muscle tone (tonus) is:✓ A state of partial, sustained contraction maintaining posture
Q11. The strength of a muscle's contraction can be increased by recruiting more:✓ Motor units
Q12. Smooth muscle differs from skeletal muscle in that it:✓ Lacks striations and contracts slowly and involuntarily
Q13. Cardiac muscle is unique in being:✓ Striated, involuntary and branched with intercalated discs
Q14. Muscle fatigue during prolonged activity is due mainly to:✓ Depletion of energy stores and build-up of lactic acid
Q15. Neural control of muscle tone and posture is coordinated importantly by the:✓ Cerebellum
Q16. The phenomenon where a stronger stimulus recruits more muscle fibres to give a stronger contraction is called:✓ Motor unit recruitment