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C3.1.13—Hypothalamus and pituitary control

Hypothalamus and pituitary control links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.13
Level
SL

Exam analysis

Chance of appearing3%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks1–4

Common command terms

  • Suggest
  • Describe
  • State
  • Identify
  • Label
  • Explain
  • Outline

Scoring notes

Common mistake
Confusing releasing hormones from the hypothalamus with hormones secreted by the pituitary.

Recent exam appearances

May 2025Paper2 ["SL"] · TZ38(a)[ 4 ]C3.1.13—Hypothalamus and pituitary control
November 2016Paper1 ["SL"] · TZ030[ 1 ]C3.1.13—Hypothalamus and pituitary control
November 2014Paper3 ["SL"] · TZ02(a)[ 2 ]C3.1.13—Hypothalamus and pituitary control
May 2010Paper2 ["SL"] · TZ13(c)[ 1 ]C3.1.13—Hypothalamus and pituitary control
Practice this objective

Coverage 2010–2025 · Updated 16 Jul 2026

The hypothalamus coordinates endocrine control through the pituitary

The hypothalamus coordinates endocrine control through the pituitary.

The hypothalamus links neural information to hormone release and regulates the pituitary with releasing or inhibiting signals. Pituitary hormones then act on distant glands or tissues.

stimulus or brain signal → hypothalamus → pituitary → target gland/tissue → feedback.

A hypothalamic signal can control pituitary FSH release, which then influences reproductive tissues.

The hypothalamus and pituitary are control centres, not the final target for every hormone they regulate.

Hypothalamus and pituitary control

Assessment in practice

1–2 marks
How it is assessed

This objective is assessed through structured response, commonly using Suggest / Describe / State.

Command terms

Suggest / Describe / State / Identify / Label / Explain / Outline

What earns marks

Mark schemes reward named structures, correct direction of information flow and explanations that keep the sequence causal.

Watch for

Confusing releasing hormones from the hypothalamus with hormones secreted by the pituitary.

Representative question

Question 1

[Maximum number: 7]

Explain the roles of named hormones in the development and function of the sexual reproductive systems in males and females.

Body-System Integration

  • Nervous signals, hormones and blood transport integrate organs into coordinated systems; emergent functions arise from their interactions.
  • Sensory neurons carry receptor input to the CNS; motor neurons carry output to effectors. Mixed nerves contain both fibre types.
  • Reflex arcs provide rapid involuntary responses through sensory, relay and motor neurons. The spinal cord also links the brain and peripheral nerves.
  • Cerebral hemispheres support conscious processing; the cerebellum coordinates movement and balance; the medulla adjusts ventilation and heart activity.
  • The hypothalamus links nervous and endocrine control through the pituitary. Pineal melatonin helps time sleep; adrenal epinephrine supports acute stress responses.
  • Baroreceptors and chemoreceptors provide feedback about pressure, CO2, pH and O2.
  • The CNS controls voluntary swallowing and egestion, while the enteric nervous system coordinates gut peristalsis.

Concept essentials

  • Hypothalamus and pituitary control depends on linking the stimulus to the coordinating structure or signal.
  • The pathway for hypothalamus and pituitary control must keep information flow and response direction clear.
  • Named tissues, hormones, neurons or effectors give hypothalamus and pituitary control its biological specificity.
  • Evidence about hypothalamus and pituitary control is strongest when structure, mechanism and outcome are connected.
ConceptIB Biology SL