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AISSU Sports University Muscle Physiology — practice questions

Explore 28 free Muscle Physiology questions in AISSU Sports University Physiology. Open each question or exercise to read its content, reference answers and available explanation.

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Muscle Physiology questions and exercises with answers

Showing questions 1–28 of 28.

A coach asks what the smallest working unit of a skeletal muscle fibre is. The answer is the:Read the answer and worked solution →Contraction begins when one protein is pulled by another. The protein doing the pulling is:Read the answer and worked solution →Because actin and its regulatory proteins form narrower strands, actin is called the:Read the answer and worked solution →Myosin strands with their many heads carry more mass, so myosin is called the:Read the answer and worked solution →During contraction the thin filaments are pulled and slide past the thick ones. That account is called the:Read the answer and worked solution →As a sarcomere contracts, the Z lines are drawn closer and one band shrinks. That band is the:Read the answer and worked solution →The plasma membrane wrapped around a skeletal muscle fibre is called the:Read the answer and worked solution →Deep folds in that membrane carry the electrical signal into the interior of the fibre. They are the:Read the answer and worked solution →Before myosin can grip, one regulatory protein must move aside to expose the binding site. That protein is:Read the answer and worked solution →Once the site is exposed, a link forms between actin and a myosin head. That link is a:Read the answer and worked solution →The point where a motor neuron's terminal meets a muscle fibre is called the:Read the answer and worked solution →Skeletal muscle differs from cardiac and smooth muscle in that it works only when it receives:Read the answer and worked solution →A single motor neuron supplying only a few fibres allows fine control. Such an arrangement is a:Read the answer and worked solution →One brief stimulus produces a single isolated contraction. That contraction is a:Read the answer and worked solution →When signals arrive so fast that their effects add together, the result is called wave:Read the answer and worked solution →Every muscle contraction, and relaxation afterwards, needs a supply of:Read the answer and worked solution →Muscle cells can regenerate that molecule in three ways: aerobic respiration, anaerobic glycolysis and:Read the answer and worked solution →After death the same molecule is lost entirely and the cross-bridges cannot release. The stiffening that follows is:Read the answer and worked solution →A sprinter gasps long after finishing. The extra oxygen taken in to make up for anaerobic work is the:Read the answer and worked solution →Endurance training builds slow fibres, while short powerful lifting relies on fast glycolytic fibres and thickens them through:Read the answer and worked solution →Catch the sarcomere partsRead the answer and worked solution →Pop the fibre typesRead the answer and worked solution →Run the muscle gatesRead the answer and worked solution →Slice the muscle wordsRead the answer and worked solution →Endurance or powerRead the answer and worked solution →Sort the muscle wordsRead the answer and worked solution →Type the numberRead the answer and worked solution →Muscle bingoRead the answer and worked solution →

Worked practice questions

A coach asks what the smallest working unit of a skeletal muscle fibre is. The answer is the:

  1. Sarcomere
  2. Sacrum bone
  3. Scapula bone
  4. Sternum bone
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Correct answer: A. Sarcomere

1. Contraction happens through an organised arrangement of filaments. 2. That repeating arrangement is what shortens when the muscle works. 3. The functional unit is the sarcomere. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._

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Contraction begins when one protein is pulled by another. The protein doing the pulling is:

  1. Mycelium
  2. Myosin
  3. Melanin
  4. Mucin gel
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Correct answer: B. Myosin

1. Two contractile proteins interlock inside the sarcomere. 2. One has heads that grip and haul on the other. 3. The puller is myosin, and what it pulls is actin. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._

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Because actin and its regulatory proteins form narrower strands, actin is called the:

  1. Thin filament
  2. Thick filament
  3. Third filament
  4. Thorn filament
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Correct answer: A. Thin filament

1. Compare the bulk of the two filament types. 2. Actin plus troponin and tropomyosin is slimmer than myosin. 3. Actin is therefore the thin filament. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._

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