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AISSU Sports University Physiology — practice by topic

Browse 28 questions across 4 Physiology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physiology topics

Anatomy and Physiology (28)Muscle Physiology (28)Physiology (28)Sports Science (28)

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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 →

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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