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C2.1.10 (HL)—Epinephrine (adrenaline) mechanism

Epinephrine binds a membrane receptor, activates a G protein and stimulates cAMP production to create rapid intracellular responses, linking signal detection to a specific target-cell response.

Syllabus
First assessment 2025
Objective
C2.1.10
Level
HL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1A
Typical marks1–3

Common command terms

  • Explain

Recent exam appearances

May 2025Paper2 ["HL"] · TZ15(b)[ 3 ]C2.1.10 (HL)—Epinephrine (adrenaline) mechanism
May 2025Paper1A ["HL"] · TZ218[ 1 ]C2.1.10 (HL)—Epinephrine (adrenaline) mechanism
Practice this objective

Coverage 2025–2025 · Updated 15 Jul 2026

Concept essentials

  • Epinephrine binds to receptors in the cell membrane.
  • Epinephrine signalling activates a G protein.
  • Adenylyl cyclase produces cAMP after pathway activation.
  • cAMP acts as a second messenger that mediates cellular responses.
ConceptIB Biology HL