Connect both Supplement metabolic effects of adrenaline
Pair increased blood glucose concentration with increased heart rate.
Exam scope and assessment notes
Extended only (Supplement) · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- Recall electrical impulses, blood transport, gland secretion and the distinction between a stimulus and a body response.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which pair supplies both Supplement metabolic effects?
What you will learn
- Give both required metabolic response directions
- Separate substrate availability and pumping frequency
Connect both Supplement metabolic effects of adrenaline
Supplement requires both increases: blood glucose concentration and heart rate. Substrate availability and pumping frequency are different roles. Original teaching model.
| Feature | Meaning |
|---|---|
| Glucose concentration | Increases; substrate available for respiration |
| Heart rate | Increases; more beats per minute |
| Output limitation | Volume per beat is needed for minute blood output |
| Core distinction | Breathing rate and pupil diameter remain Core effects |
Give both required metabolic response directions
The Supplement adrenaline account has two required metabolic effects: increased blood glucose concentration and increased heart rate. The first concerns glucose availability in circulating blood; the second concerns how frequently the heart beats. A complete answer includes both quantities and the increase direction for each, rather than replacing them with a vague statement that metabolism speeds up.
Glucose can be used as a substrate in cellular respiration. A faster heart beats more frequently and can help supply active tissues through circulation. These are complementary roles: glucose availability concerns fuel supply, while heart rate concerns pumping frequency. The heart does not create glucose simply by beating faster, and glucose concentration does not directly count heart beats.
Separate substrate availability and pumping frequency
Heart rate alone is not the same as volume of blood pumped per minute. Minute output also depends on the volume pumped in each beat. If only rate data are supplied, describe the increase in beats per minute without calculating an unsupported total output. This qualification makes the application more accurate without changing the required direction.
The Core account additionally includes increased breathing rate and pupil diameter. Those remain valid Core effects, but a question specifically about the two Supplement metabolic effects needs blood glucose concentration and heart rate. Use the requested scope and then explain how glucose substrate and circulation support activity, keeping the two causal roles distinct.
Pause and explain
Can heart rate alone calculate total blood volume pumped per minute?
Worked example
Give and explain both Supplement metabolic effects.
Show the worked solution
- Blood glucose concentration increases, supporting substrate availability.
- Heart rate increases, increasing pumping frequency.
Answer Increased blood glucose concentration and increased heart rate; these concern glucose availability and pumping frequency respectively.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
State both required Supplement metabolic effects of adrenaline.
Give me a hint
Use the two named quantities.
Compare my reasoning
- Blood glucose concentration increases.
- Heart rate increases.
Increased blood glucose concentration and increased heart rate.
Look for these in your work
- Include blood glucose concentration
- Include increased heart rate
Explain the different roles of increased glucose availability and increased heart rate.
Give me a hint
Separate substrate supply and pumping frequency.
Compare my reasoning
- Glucose is available for use in cellular respiration.
- Increased heart rate raises the frequency of heart pumping.
Glucose availability supplies respiratory substrate; increased heart rate raises pumping frequency and can support circulation to active tissues.
Look for these in your work
- Explain substrate role
- Explain circulation role
An invented record shows heart rate increasing from 60 to 90 beats/min but gives no volume per beat. What change can you calculate, and what total output cannot you calculate?
Give me a hint
Use supplied rate data only.
Compare my reasoning
- Rate rises by 30 beats/min, a 50% increase.
- Minute blood output needs volume per beat as well.
Heart rate rises by 30 beats/min, or 50%. Total blood volume pumped per minute cannot be calculated without volume per beat.
Look for these in your work
- Calculate the supplied rate change
- Identify the missing output input
Common mistakes
- Omitting glucose and listing only the Core pupil effect.
- Equating heart rate alone with a known minute blood output.
What can you explain now?
Can heart rate alone calculate total blood volume pumped per minute?
Compare with the explanation
No; volume per beat is also needed
Rate and volume per beat determine minute output together.
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Make it stick
State both Supplement effects and explain their distinct contributions to activity.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.