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BUILD A PROCESS

Respond to dehydration with ADH

Build the feedback route controlling water recovery.

Build a process

Use the up and down buttons to build the sequence, then check your reasoning. Some biological events overlap; follow the simplified pathway described here.

  1. 1
    Less water is lost in urine
  2. 2
    Collecting ducts become more water-permeable
  3. 3
    ADH release increases
  4. 4
    Osmoreceptors detect the change
  5. 5
    Blood osmolarity rises
Read the complete pathway
  1. Blood osmolarity rises. Water loss can concentrate dissolved solutes.
  2. Osmoreceptors detect the change. Hypothalamic receptors respond to osmotic conditions.
  3. ADH release increases. ADH is made in the hypothalamus and released from the posterior pituitary.
  4. Collecting ducts become more water-permeable. Aquaporin insertion increases recovery if an osmotic gradient is present.
  5. Less water is lost in urine. Concentrated urine conserves water and reduces the disturbance.

Explain what you observed

Does ADH mainly increase filtration?

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Your study notes

Take the next step

Connect this activity with your lesson notes and chapter practice.

Read a related learning guide →Practise Homeostasis →Open the student notes folder ↗

Concepts and sources

Curriculum connections: 15.3. Selected concepts.

Read the supporting source ↗PMDC curriculum ↗

Questions and explanations are original teaching material; these are not official exam questions.

Keep exploring Homeostasis

Model

From filtrate to urine

Investigate water reabsorption and urine output.

Build a process

Follow urine from nephron to outside

Separate the urine route from the blood route.

Sort & explain

Filtration, reabsorption or secretion?

Track directions across the nephron.