Growth factors are local regulators that (A) are produced by the anterior pituita

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Growth factors are local regulators that (A)...

$\begin{equation} \begin{array}{l}{\text { Growth factors are local regulators that }} \\ {\text { (A) are produced by the anterior pituitary. }} \\ {\text { (B) are modified fatty acids that stimulate bone and cartilage }} \\ {\text { growth. }} \\ {\text { (C) are found on the surface of cancer cells and stimulate }} \\ {\text { (D) bind to cell-surface receptors and stimulate growth and }} \\ {\text { development of target cells. }}\end{array} \end{equation}$

$\begin{equation}
\begin{array}{l}{\text { Growth factors are local regulators that }} \\ {\text { (A) are produced by the anterior pituitary. }} \\ {\text { (B) are modified fatty acids that stimulate bone and cartilage }} \\ {\text { growth. }} \\ {\text { (C) are found on the surface of cancer cells and stimulate }} \\ {\text { (D) bind to cell-surface receptors and stimulate growth and }} \\ {\text { development of target cells. }}\end{array}
\end{equation}$

Key Concepts

Signal Transduction Pathways

Signal transduction pathways refer to the series of molecular events that occur after a growth factor binds to its receptor. These pathways involve various intracellular molecules, such as kinases and transcription factors, which work together to convert an external signal into a specific cellular response, such as cell division or differentiation.

Paracrine and Autocrine Signaling

Paracrine and autocrine signaling describe the ways that growth factors can act locally. In paracrine signaling, the growth factors affect nearby target cells, while in autocrine signaling, the cell that secretes the factor also responds to it. Both mechanisms are crucial for fine-tuning cell growth, development, and tissue repair in a localized context.

Growth Factors

Growth factors are biologically active molecules that regulate cell proliferation, differentiation, and survival. They typically act as local regulators rather than systemic hormones, meaning they affect nearby cells through direct interactions rather than circulating through the bloodstream to distant targets.

Cell-Surface Receptors

Cell-surface receptors are proteins located on the plasma membrane that bind growth factors and other signaling molecules. When a growth factor binds to its specific receptor, it triggers a cascade of intracellular signals that ultimately lead to changes in gene expression and cellular activity.

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