Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In turn, this receptor alters intracellular molecules creating a response.
The two stages in the signal transduction process:
1. A signaling molecule activates a specific receptor protein on the cell membrane.
2. A second messenger transmits the signal into the cell, eliciting a physiological response. In either step, the signal can be amplified. Thus, one signalling molecule can cause many responses.
Red Blood Cells
Visualisation of red blood cells (RBCs), red cells, haematids, erythroid cells or erythrocytes.
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