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PUCET (Punjab) Locomotion and Movement — practice questions

Explore 8 free Locomotion and Movement questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Locomotion and Movement questions and exercises with answers

Showing questions 1–8 of 8.

The three types of muscle in human body are:Read the answer and worked solution →Functional unit of skeletal muscle is the:Read the answer and worked solution →Thick filaments in skeletal muscle are made of:Read the answer and worked solution →Calcium for muscle contraction is released from:Read the answer and worked solution →Knee joint type:Read the answer and worked solution →The smallest bones of human body are in the:Read the answer and worked solution →Adult human skeleton has approximately how many bones?Read the answer and worked solution →Tendons connect:Read the answer and worked solution →

Worked practice questions

The three types of muscle in human body are:

  1. Skeletal only
  2. Skeletal (striated), smooth (visceral), and cardiac
  3. Random
  4. Just smooth
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Correct answer: B. Skeletal (striated), smooth (visceral), and cardiac

**Three muscle types:** (1) Skeletal — striated, voluntary, attaches to bones. (2) Smooth — non-striated, involuntary, in gut/blood vessels. (3) Cardiac — striated, involuntary, only in heart, has intercalated discs.

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Functional unit of skeletal muscle is the:

  1. ATP
  2. Cell
  3. Myosin
  4. Sarcomere (segment between two Z-discs)
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Correct answer: D. Sarcomere (segment between two Z-discs)

**Sarcomere:** contractile unit. Spans Z-line to Z-line. Contains thin filaments (actin) anchored to Z, thick filaments (myosin) in center (M-line). **Bands:** A (thick filament length, dark), I (thin only, light), H (thick only, in middle). Shortens during contraction.

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Thick filaments in skeletal muscle are made of:

  1. Collagen
  2. Myosin
  3. Actin
  4. Tropomyosin
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Correct answer: B. Myosin

**Thick filaments:** myosin II. **Each thick filament:** ~300 myosin molecules bundled. Each myosin has 2 heavy chains (with 2 heads and a coiled-coil tail) + 4 light chains. Heads form cross-bridges with actin, hydrolyze ATP, generate force. **Thin filaments:** actin (helical filament of G-actin monomers) + tropomyosin + troponin.

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