A cluster of tumor cells that produces and secretes growth factors to induce surrounding cells to grow and divide is showing which type of cell-to-cell signaling?

Question

Quizplus · Accepted Answer

The cluster of tumor cells is not contacting itself to produce more growth factors, so it is not autocrine signaling. It is also not traveling long distances through the bloodstream to affect distant tissues, so it is not endocrine signaling. It is also not originating from nerve cells, so it is not neuroendocrine signaling. However, the tumor cells are producing growth factors that are affecting nearby cells, making it paracrine signaling.

A Cluster of Tumor Cells That Produces and Secretes Growth