Cell Signaling: How Communication Happens in Cells

  1. Reception: the signal is received at a receptor (it can be on the cell surface, as illustrated below, or inside the cell).
  2. Transduction: the message is communicated through a series of steps causing a…
  3. Response: a cellular reaction to the signal
Demonstrates how a signal molecule can move from the extracellular fluid to eventually activating cellular responses.

Figure 11.5, page 191, Campbell's Biology, 5th Edition

Endocrine System: Two Ways Messages Are Received

Demonstrates the interaction between a secretory and target cell when using a chemical signal that binds to the receptor on the plasma membrane of the target cell. Demonstrates the interaction between a secretory and target cell when using a chemical signal that binds to the receptor inside the target cell's cytoplasm.

Figures 45.3(a) and 45.3(b), page 897, Campbell's Biology, 5th Edition

Steroid and Thyroid Hormones: Detail View

Gives a detailed view of a steroid hormone's effect on a target cell.

Figure 45.5, page 898, Campbell's Biology, 5th Edition