Mer Scott
Test por , creado hace más de 1 año

• Understand the energy sources required for muscle contraction • Describe 3 types of muscle fibre and understand their different properties and functions. • Understand the different types of skeletal muscle function (twitch, twitches and tetanus) by the motor unit. • Summarise key effects of exercise & fatigue on muscle physiology

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Mer Scott
Creado por Mer Scott hace más de 7 años
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L26 Skeletal Muscle Function, Energy and Types

Pregunta 1 de 12

1

Choose the correct statements about sources of energy for skeletal muscle contraction

Selecciona una o más de las siguientes respuestas posibles:

  • ATP can be recycled and the stores are long lasting.

  • ATP is limited in it's stores and only fuels contraction for a few seconds.

  • CP, creatine phosphate, is stored in the muscle.

  • Pi is a product of ATP hydrylosis, called inorganic phosphate.

  • Energy from CP breakdown is used to resynthesize ATP.

  • With CP you can have a contraction up to 50 s.

  • The third back up system for energy generation in muscle is the metabolism of glucose, which can be aerobic or anaerobic.

  • The breakdown of glucose is anabolic and therefore produces free energy to resynthesize CP and ATP.

Explicación

Pregunta 2 de 12

1

Anaerobic metabolism is the breakdown of glucose via glycolysis to make ATP.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 3 de 12

1

Aerobic metabolism takes pyruvate from glycolysis to make Acetyl CoA, and then uses oxygen, to produce less ATP than anaerobic metabolism.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 4 de 12

1

Choose the incorrect statement about anaerobic metabolism.

Selecciona una o más de las siguientes respuestas posibles:

  • No O2 is used.

  • It is slow.

  • It is a short term form of energy production.

  • It is the result of glycolysis.

Explicación

Pregunta 5 de 12

1

Choose the incorrect statement about aerobic metabolism.

Selecciona una de las siguientes respuestas posibles:

  • It is faster than anaerobic metabolism.

  • O2 is used.

  • It is facilitated by a process called oxidative phosphorylation.

  • It is a long term and stable process.

Explicación

Pregunta 6 de 12

1

Which stage of skeletal muscle movement uses the MOST ATP?

Selecciona una de las siguientes respuestas posibles:

  • Excitation

  • Relaxation

  • Contraction

Explicación

Pregunta 7 de 12

1

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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 8 de 12

1

Choose the correct statement.

Selecciona una de las siguientes respuestas posibles:

  • Red muscle fibres are high in myoglobin and low in aerobic enzymes.

  • Red muscle fibres are high in myoglobin and high in aerobic enzymes.

  • White muscle fibres are high in myoglobin and low in aerobic enzymes.

  • White muscle fibres are low in myoglobin and high in aerobic enzymes.

Explicación

Pregunta 9 de 12

1

Which type of muscle fibre would a marathon runner/endurance athlete develop?

Selecciona una de las siguientes respuestas posibles:

  • More white and intermediate fibres.

  • More red and intermediate fibres.

Explicación

Pregunta 10 de 12

1

Choose the incorrect statement about muscle contractions.

Selecciona una de las siguientes respuestas posibles:

  • A twitch is a single muscle contraction.

  • The calcium level in the sarcoplasm lasts longer than the muscle tension.

  • A series of spaced twitches with increasing tension amplitude is a treppe.

  • Complete tetanus is a series of closely spaced twitches summated where you cannot differentiate individual twitches.

Explicación

Pregunta 11 de 12

1

Which of these is NOT responsible for increasing amplitudes in a treppe?

Selecciona una de las siguientes respuestas posibles:

  • Increasing and sustained calcium levels in the sarcoplasm

  • Increased sensitivity to calcium of myosin and actin

  • Heat

  • Cross bridge volatility

Explicación

Pregunta 12 de 12

1

Choose the correct statements about muscle training.

Selecciona una o más de las siguientes respuestas posibles:

  • By strength training you increase the number of muscle fibres.

  • By strength training you increase the number of contractile filaments.

  • Hypertrophy is the decreasing of contractile filaments.

  • Increasing the number of contractile filaments means you rely more on aerobic metabolism.

  • Endurance training increases the number of blood vessels (capillaries), mitochondria, and aerobic enzymes in muscle.

  • Endurance training improves aerobic metabolism.

Explicación

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