AQA GCSE Biology

Hormones & endocrine system

AQA GCSE Biology revision on Hormones & endocrine system. 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 organ detects a rise in blood glucose concentration and initiates the release of insulin?

    • A) The small intestine
    • B) The pancreas gland
    • C) The liver tissues
    • D) The adrenal cortex
    Show answer

    Answer: The pancreas gland

    The pancreas contains specialised cells that function as receptors to monitor blood glucose. When levels rise, it secretes insulin to lower them; when levels drop, it secretes glucagon to raise them.

  2. Question 2

    What is the primary physiological effect of glucagon on liver cells?

    • A) Increases glucose uptake
    • B) Converts glycogen stored
    • C) Stimulates lipid synthesis
    • D) Inhibits protein breakdown
    Show answer

    Answer: Converts glycogen stored

    When blood glucose is low, glucagon is released by the pancreas. It triggers the liver to convert stored glycogen back into glucose, which is then released into the blood to restore homeostasis.

  3. Question 3

    Which endocrine gland is responsible for secreting adrenaline to prepare the body for 'fight or flight'?

    Show answer

    Answer: adrenal

    Adrenaline is produced by the adrenal glands in response to stressful or dangerous situations. It increases heart rate and boosts the delivery of oxygen and glucose to the brain and muscles.

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