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4.5 Homeostasis and Response

This topic area explains how organisms detect change and keep internal conditions in workable limits. Nerves and hormones are different signalling systems solving the same control problem.

Core Role

  • Explain the receptor-coordination centre-effector model clearly.
  • Connect rapid nervous responses with slower hormonal control.
  • Show that stable internal conditions are necessary for cells and enzymes to work well.

Learning Objective Map

Each topic page in this module now opens with a specification-aligned Learning Objectives section. Use these links to jump straight to the objective map for each topic, then into the teaching sections linked from that map.

Topic Objective map focus
4.5.1 Homeostasis control-system model; blood-glucose control; thermoregulation; kidney function; ADH and water balance
4.5.2 The Human Nervous System nervous-system coordination; neurones and synapses; reflex arcs; brain regions; eye structure and vision defects
4.5.3 Hormonal Coordination in Humans endocrine glands; adrenaline and thyroxine; reproductive hormones and cycle control; contraception; infertility treatment
4.5.4 Plant Hormones auxin and tropisms; practical investigations; horticultural uses of plant hormones

Topic Pages