IB Biology HL C3.1.12 Epinephrine Adrenaline Questions

IB Biology HL C3.1.12 links stress or activity with epinephrine release. Practise its heart effects and how blood flow, ventilation and glucose support working muscle.

Exam points

Explain how epinephrine increases sinoatrial-node signalling and heart rate during anticipated activity, supporting blood, oxygen and glucose delivery to working muscles.

[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.

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IB Biology HL C3.1.12 Epinephrine Adrenaline Questions question 1