Compare nervous and hormonal control by duration of effect
Separate how long a response lasts from how quickly it begins.
Mapped to the named 0654 section using teaching from the corresponding single-science course. A 0654-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade.
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
What is duration of effect?
What you will learn
- Define duration rather than onset
- Complete the two-part comparison
Compare nervous and hormonal control by duration of effect
Compare both dimensions: nervous generally faster and shorter; hormonal generally slower and longer. Onset and duration are separate measurements. Original teaching model.
| Feature | Meaning |
|---|---|
| Onset | Time until the effect begins |
| Duration | Time the effect persists |
| Nervous | Generally faster; shorter effect |
| Hormonal | Generally slower; longer effect |
Define duration rather than onset
Duration of effect describes how long the response persists. It differs from onset, which describes how quickly the response starts. A signal can begin rapidly but have a longer-lasting effect, or begin slowly and then persist briefly. A question asking about duration therefore cannot be answered only with the word fast or slow.
In the required general comparison, nervous effects are usually short-lived, while hormonal effects are generally longer-lasting. Neural coordination can switch an effector response on and off rapidly. Blood-borne hormone activity can persist over a longer period. These descriptions are comparative patterns rather than claims that every neural effect is brief or every hormone lasts for an identical time.
Complete the two-part comparison
The complete comparison has two dimensions: nervous control is generally faster in action and shorter in effect; hormonal control is generally slower in action and longer in effect. Place speed and duration in separate rows or sentences to prevent a statement about one being mistaken for a statement about the other.
For a supplied record, calculate duration from the stated start and end of the effect, or use a duration column if it is already given. Convert minutes to seconds before comparing with a seconds-only value. Do not use the time until response onset as though it were the time the response lasted. The following model data practise those distinctions.
Sources for this lesson
Pause and explain
Which statement supplies both required dimensions?
Worked example
Give the complete speed-and-duration comparison.
Show the worked solution
- Nervous: generally faster onset and shorter effect.
- Hormonal: generally slower onset and longer effect.
Answer Nervous control generally acts faster and has a shorter effect; hormonal control generally acts slower and has a longer effect.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
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.
Compare nervous and hormonal control by duration of effect.
Give me a hint
State both relative persistence patterns.
Compare my reasoning
- Nervous effects are generally shorter-lived.
- Hormonal effects are generally longer-lasting.
Nervous effects are generally shorter; hormonal effects are generally longer.
Look for these in your work
- Compare both durations
- Keep the contrast general
A supplied effect begins at 10 s and ends at 70 s. Find its duration and distinguish it from its onset.
Give me a hint
End minus start gives persistence.
Compare my reasoning
- Duration is 70 − 10 = 60 s.
- Onset is at 10 s, not a 10 s duration.
Duration is 60 s; onset is at 10 s in the supplied record.
Look for these in your work
- Calculate persistence
- Keep onset separate
Improve: hormonal control is longer, so it must always start later than every nervous response.
Give me a hint
Duration does not logically establish onset.
Compare my reasoning
- Longer refers to persistence, not start time.
- Use the general slower/longer contrast and allow variation.
Longer duration does not itself prove a later onset. Hormonal control is generally slower and longer-lasting, but timings vary between responses.
Look for these in your work
- Separate the two dimensions
- Avoid an absolute onset claim
Common mistakes
- Treating fast and long as interchangeable descriptions.
- Subtracting onset values to claim effect duration.
What can you explain now?
Which statement supplies both required dimensions?
Compare with the explanation
Nervous generally faster and shorter; hormonal generally slower and longer
It compares speed and duration separately.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Give the two-part comparison and distinguish onset from duration.
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.