Describe Modes of cell signaling (endocrine)?

Endocrine cell signaling involves the release of signaling molecules, known as hormones, into the bloodstream by endocrine glands. These hormones travel throughout the body and bind to specific receptors on target cells, triggering a response. There are three main modes of endocrine cell signaling:

1. Autocrine signaling: In this mode, the signaling molecule acts on the same cell that released it. The hormone binds to receptors on the surface of the cell that secreted it, leading to a cellular response.

2. Paracrine signaling: In paracrine signaling, the signaling molecule acts on nearby target cells. The hormone is released by a cell and diffuses through the extracellular fluid to neighboring cells, where it binds to receptors and triggers a response.

3. Endocrine signaling: This is the classic mode of endocrine signaling, where hormones are released into the bloodstream and travel to distant target cells. The hormones bind to specific receptors on the surface of target cells, initiating a signaling cascade that leads to a cellular response.