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AS & A Level · AS/A Level

Biology

Homeostasis and coordination

Name: ____________________Date: October 10, 2026
  1. 1.

    Explain negative feedback using a rise in blood glucose after a meal.

    [3 marks] · no calculator
  2. 2.

    Explain why an action potential is described as all-or-nothing rather than becoming larger for every stronger stimulus.

    [3 marks] · no calculator
  3. 3.

    Explain how increased ADH affects collecting-duct permeability and urine concentration during dehydration.

    [3 marks] · no calculator
  4. 4.

    Explain how myelination increases conduction speed while allowing action potentials to be regenerated.

    [3 marks] · no calculator
  5. 5.

    Glucose is normally absent from urine, but appears when plasma glucose becomes very high. Explain using filtration and selective reabsorption, and why this observation alone does not locate a kidney lesion.

    [4 marks] · no calculator
  6. 6.

    An inhibitor blocks acetylcholinesterase at a neuromuscular junction. Predict an initial effect and a reason prolonged exposure need not produce indefinitely stronger muscle contraction.

    [4 marks] · no calculator

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Marking points are indicative, not an official mark scheme. Accept equivalent valid methods and supported interpretations that address the task; award each mark once without requiring the model wording.