AQA GCSE Biology

Kidneys & osmoregulation

AQA GCSE Biology revision on Kidneys & osmoregulation. Aligned to the AQA GCSE Biology 8461 specification. This bank has 25 practice questions on this topic.

Sample questions (3 of 25)

  1. Question 1

    Which hormone is released by the pituitary gland when the blood water concentration is too low?

    • A) Adrenaline
    • B) Insulin
    • C) ADH
    • D) Thyroxine
    Show answer

    Answer: ADH

    When blood water levels drop, the pituitary gland secretes Antidiuretic Hormone (ADH). This hormone increases the permeability of the kidney tubules, allowing more water to be reabsorbed back into the blood.

  2. Question 2

    What is the name of the process by which small molecules like water and glucose are forced out of the blood and into the kidney tubules?

    • A) Active transport
    • B) Filtration
    • C) Diffusion
    • D) Osmosis
    Show answer

    Answer: Filtration

    Blood pressure forces small molecules, including water, glucose, ions, and urea, out of the capillaries in the glomerulus. Larger molecules like proteins and blood cells remain in the blood as they are too big to pass through the filter.

  3. Question 3

    What specific substance is removed from the body during the process of deamination in the liver?

    • A) Excess glucose
    • B) Amino acids
    • C) Urea
    • D) Fatty acids
    Show answer

    Answer: Amino acids

    The liver breaks down excess amino acids into ammonia, which is highly toxic. This ammonia is then immediately converted into urea for safe excretion by the kidneys.

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