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IB Biology HL C3.1.12 Epinephrine Adrenaline Questions

Explore how adrenal epinephrine released during stress raises cardiac output, ventilation and respiratory-substrate availability for intense muscle action in IB Biology HL C3.1.12.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify adrenal epinephrine secretion during stress or intense activity and explain its increase of sinoatrial-node activity and heart rate.
  • Explain how epinephrine increases ventilation, blood flow and respiratory-substrate availability to prepare skeletal muscles for action.

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Study C3.1.12—Epinephrine (adrenaline) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C3.1.12 Epinephrine Adrenaline Questions question 1

[Maximum number: 2]

The diagram shows a G protein, bound to a G protein-coupled receptor (GPCR), a transmembrane receptor which responds to epinephrine (adrenaline).

Figure for Question IB Biology HL C3.1.12 Epinephrine Adrenaline Questions question 1 — IB Biology HL

Describe two ways in which epinephrine in the body facilitates intense muscle contraction. [2]
1.
2.

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