Cell Signaling Simulation

Reception, transduction, amplification and response

Experiment

Mission: change ligand concentration and observe how receptor occupancy controls the response.

Run the model

1.00×

Signal conditions

45 nM
60%
65%
35%

Live measurements

Receptor occupancy0%
Relay activation0%
Second messengers0 units
Kinase activity0%
Cell response0%
Amplification0×
The model is paused. Start it or use Step to follow one update at a time.

Signal activity over time

ReceptorKinaseResponse

View and focus

1.00×
Tap a signaling structure to label it and open its live microscopic view.

Teacher tools

Teacher Mode exposes presets, pathway arrows, a laser pointer and freehand annotation.

Interactive lesson

Ready. Narration will not start automatically.
Step 0 / 100%

What to watch

Start the complete lesson or choose a chapter.

Transcript

The lesson is ready.

Chapters

Cell Signaling Simulation

Cells detect information outside or inside the cell and convert it into a controlled response. This simulation connects receptor binding, transduction, amplification, response and termination.

Learning objectives

  • Explain how ligand concentration and receptor affinity affect binding.
  • Trace a signal from a receptor through relay proteins and second messengers.
  • Describe why signaling cascades amplify a small input.
  • Connect kinase activity to changes in gene expression or cell activity.
  • Explain why signal termination is necessary.

Key concepts

Reception: a matching ligand changes a receptor. Transduction: activated proteins pass information onward. Amplification: one active component can activate many molecules. Response: the cell changes enzyme activity or gene expression. Termination: enzymes remove activating phosphate groups and messengers are broken down.

Suggested experiments

  • Raise ligand concentration while keeping receptor amount fixed.
  • Compare low and high binding affinity.
  • Use Second messenger amplification and watch how a small receptor signal becomes large.
  • Increase signal removal after the response is high.

Questions for exploration

  • Why does receptor occupancy eventually level off?
  • Can high receptor amount compensate for weak affinity?
  • Which control changes how quickly the response ends?

Real-world applications

Insulin signaling regulates glucose use, adrenaline rapidly prepares cells for activity, neurotransmitters carry information between neurons, and many medicines block or activate receptors.

Common misconceptions

  • A signal molecule usually carries information; it does not become the response.
  • Not every ligand can bind every receptor.
  • Amplification is controlled and can be reversed.
  • Cell signaling is dynamic, not a permanent on-or-off switch.

Cell signaling quiz

0 / 7

Answer each question for instant feedback.