Cell Communication Overview (Cell Signaling)

Front

What is cell communication?

Back

Cell communication (or cell signaling) is the process by which cells detect, process, and respond to signals from their environment and other cells.

Front

What are the major modes of cell communication?

Back

Direct Cell-to-Cell Contact (Physical Interaction) and Chemical Signaling (Signal Molecules).

Front

What is direct cell-to-cell contact?

Back

Occurs when cells physically touch each other to transmit signals, similar to a face-to-face conversation.

Front

Give an example of direct cell-to-cell contact.

Back

Immune cell interactions, such as antigen-presenting cells (APCs) interacting with Helper T-cells.

Front

What role do antigen-presenting cells (APCs) play in cell communication?

Back

APCs act as scouts, capturing antigens and displaying them on their surface via MHC proteins.

Front

How do Helper T-cells participate in cell communication?

Back

Helper T-cells directly bind to APCs, read the presented antigen, activate other immune cells, and coordinate the immune response through cytokine release.

Front

What is the function of Killer T-cells (Cytotoxic T-cells)?

Back

They make direct contact with infected or cancerous cells, deliver a death signal via perforins and granzymes, causing apoptosis in target cells.

Front

What is chemical signaling in cell communication?

Back

A signaling cell releases molecules that bind to receptors on target cells, altering their behavior.

Front

What is an analogy for chemical signaling?

Back

Like sending a text message — the signal travels, is received, and prompts a response.

Front

What is local signaling?

Back

Signals affect nearby cells only, such as neurotransmitters released across synapses between neurons.