Signal Transduction & Cell Communication

Front

What is signal transduction?

Back

The process by which a cell responds to external signals through a series of molecular events, leading to a cellular response.

Front

Define paracrine signaling.

Back

A form of cell communication where a cell produces a signal to induce changes in nearby cells.

Front

What is synaptic signaling?

Back

A type of signaling that occurs in the nervous system where neurotransmitters are released from a neuron to communicate with a neighboring neuron or muscle cell.

Front

Explain long-distance signaling.

Back

Communication between cells that are far apart, often involving hormones released into the bloodstream.

Front

What role do G proteins play in cell signaling?

Back

G proteins act as molecular switches that transmit signals from receptors on the cell surface to target molecules inside the cell.

Front

What is cAMP and its significance in signaling?

Back

Cyclic adenosine monophosphate (cAMP) is a secondary messenger important in many biological processes, amplifying the signal from a receptor.

Front

Define negative feedback in biological systems.

Back

A regulatory mechanism in which a change in a physiological variable triggers a response that counteracts the initial change.

Front

What is positive feedback?

Back

A process that enhances or amplifies changes; it pushes a system away from its starting state.

Front

List the three main stages of cell signaling.

Back

1. Reception 2. Transduction 3. Response

Front

What is the function of ligands in cell signaling?

Back

Ligands are molecules that bind to receptors to initiate a signaling cascade.