Q BankQuestion BankDocsDocuments

C2.1.14 (HL)—Regulation by feedback

Feedback regulation adjusts hormone secretion when downstream hormone levels or physiological effects inhibit or stimulate earlier control steps, linking signal detection to a specific target-cell response.

Syllabus
First assessment 2025
Objective
C2.1.14
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceMay 2022
Most common paperPaper1
Typical marks1

Recent exam appearances

May 2022Paper1 ["HL"] · TZ224[ 1 ]C2.1.14 (HL)—Regulation by feedback
Practice this objective

Coverage 2022–2022 · Updated 15 Jul 2026

Concept essentials

  • Negative feedback reduces upstream signalling when a response is already sufficient.
  • High estrogen can inhibit FSH secretion in the menstrual cycle.
  • Feedback loops help regulate hormone concentrations over time.
  • Chemical signalling systems often depend on both signal production and response-based control.
ConceptIB Biology HL