8870262
Descrição
Questão 1
Questão
Choose the correct statements about sources of energy for skeletal muscle contraction
Responda
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ATP can be recycled and the stores are long lasting.
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ATP is limited in it's stores and only fuels contraction for a few seconds.
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CP, creatine phosphate, is stored in the muscle.
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Pi is a product of ATP hydrylosis, called inorganic phosphate.
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Energy from CP breakdown is used to resynthesize ATP.
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With CP you can have a contraction up to 50 s.
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The third back up system for energy generation in muscle is the metabolism of glucose, which can be aerobic or anaerobic.
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The breakdown of glucose is anabolic and therefore produces free energy to resynthesize CP and ATP.
Questão 2
Questão
Anaerobic metabolism is the breakdown of glucose via glycolysis to make ATP.
Responda
- True
- False
Questão 3
Questão
Aerobic metabolism takes pyruvate from glycolysis to make Acetyl CoA, and then uses oxygen, to produce less ATP than anaerobic metabolism.
Responda
- True
- False
Questão 4
Questão
Choose the incorrect statement about anaerobic metabolism.
Responda
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No O2 is used.
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It is slow.
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It is a short term form of energy production.
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It is the result of glycolysis.
Questão 5
Questão
Choose the incorrect statement about aerobic metabolism.
Responda
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It is faster than anaerobic metabolism.
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O2 is used.
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It is facilitated by a process called oxidative phosphorylation.
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It is a long term and stable process.
Questão 6
Questão
Which stage of skeletal muscle movement uses the MOST ATP?
Responda
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Excitation
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Relaxation
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Contraction
Questão 7
Questão
Oxygen binding to iron appears red. Iron is a central part of myoglobin in the muscles, so the more oxygen present in the muscle, the redder the colour appears.
Responda
- True
- False
Questão 8
Questão
Choose the correct statement.
Responda
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Red muscle fibres are high in myoglobin and low in aerobic enzymes.
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Red muscle fibres are high in myoglobin and high in aerobic enzymes.
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White muscle fibres are high in myoglobin and low in aerobic enzymes.
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White muscle fibres are low in myoglobin and high in aerobic enzymes.
Questão 9
Questão
Which type of muscle fibre would a marathon runner/endurance athlete develop?
Responda
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More white and intermediate fibres.
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More red and intermediate fibres.
Questão 10
Questão
Choose the incorrect statement about muscle contractions.
Responda
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A twitch is a single muscle contraction.
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The calcium level in the sarcoplasm lasts longer than the muscle tension.
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A series of spaced twitches with increasing tension amplitude is a treppe.
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Complete tetanus is a series of closely spaced twitches summated where you cannot differentiate individual twitches.
Questão 11
Questão
Which of these is NOT responsible for increasing amplitudes in a treppe?
Responda
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Increasing and sustained calcium levels in the sarcoplasm
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Increased sensitivity to calcium of myosin and actin
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Heat
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Cross bridge volatility
Questão 12
Questão
Choose the correct statements about muscle training.
Responda
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By strength training you increase the number of muscle fibres.
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By strength training you increase the number of contractile filaments.
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Hypertrophy is the decreasing of contractile filaments.
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Increasing the number of contractile filaments means you rely more on aerobic metabolism.
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Endurance training increases the number of blood vessels (capillaries), mitochondria, and aerobic enzymes in muscle.
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Endurance training improves aerobic metabolism.
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