Forms of Chemical Signaling

Front

What are the four categories of chemical signaling in multicellular organisms?

Back

Paracrine signaling, endocrine signaling, autocrine signaling, and direct signaling across gap junctions.

Front

What is the main difference between the categories of chemical signaling?

Back

The distance the signal travels through the organism to reach the target cell.

Front

What is autocrine signaling?

Back

A type of signaling in which the signaling cell and the target cell are the same or similar, allowing the cell to send signals to itself.

Front

When does autocrine signaling often occur?

Back

During early development of an organism to ensure proper tissue development and function.

Front

How does autocrine signaling regulate pain sensation and inflammatory responses?

Back

By signaling itself to undergo programmed cell death or apoptosis, eliminating viruses in infected cells.

Front

What is juxtacrine signaling?

Back

Direct cell-to-cell contact signaling involving mechanisms such as contact-dependent signaling and gap junctions.

Front

What happens in contact-dependent signaling?

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A signaling molecule on one cell directly contacts a receptor on another cell, triggering communication and coordination.

Front

What are gap junctions in animal cells?

Back

Channels that connect the cytoplasm of neighboring cells, allowing the direct exchange of small molecules and ions.

Front

What are plasmodesmata in plant cells?

Back

Channels that connect neighboring plant cells and facilitate direct communication.

Front

What is paracrine signaling?

Back

Signaling that acts locally between cells that are close together, moving by diffusion through the extracellular matrix.