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Learning objective

Explain control of blood water potential using ADH.

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Topic

Response and homeostasis official content

Subtopic

Homeostasis

Aqa A Level BiologyOrganisms respond to changes in their internal and external environments

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Quick explanation

Explain control of blood water potential using ADH

  • This point belongs to Response and homeostasis official content, especially Homeostasis.
  • You need to be able to explain control of blood water potential using ADH.
  • The key ideas to know are ADH.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ADH

Why it matters

This objective helps connect Homeostasis to exam-style questions, flashcards, and revision notes for Response and homeostasis official content.

Quick student answer

What is the primary role of antidiuretic hormone (ADH) in the regulation of blood water potential?

Direct answer

ADH promotes water reabsorption in the kidneys, which helps to maintain blood water potential.

Key terms

  • Osmoregulation: The process by which organisms regulate the water and electrolyte balance in their bodies to maintain homeostasis.
  • Aquaporins: Membrane proteins that form channels to facilitate the transport of water across cell membranes.

Common trap

Confusing ADH with aldosterone: ADH primarily regulates water reabsorption in the kidneys, while aldosterone regulates sodium reabsorption and potassium excretion.

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