Question

Cells signalling between distant cells mediated by hormones released from specific cells that travel to target cells, producing a slower, long-lasting response is known as

• A. Paracrine signalling
• B. Endocrine signalling
• C. Autocrine signalling
• D. Direct signalling

Hint:

• Endocrine Long distance, via bloodstream, hormones, slow, long-lasting (e.g., insulin, growth hormone).
• Paracrine Local, acts on nearby cells, short diffusion (e.g., growth factors, some neurotransmitters outside synapse).
• Autocrine Acts on the same cell that secreted it.
• Synaptic Neuronal, fast, precise, across synapse via neurotransmitters.
• Contact-Dependent (Juxtacrine) Requires direct cell-cell contact.

Answer 1

The Correct Option is B

The question asks about the type of cell signaling that involves communication between distant cells via hormones, resulting in a slower and long-lasting response. In the context of biotechnology and cell communication, there are different types of signaling:

• Paracrine signalling: Involves the release of signaling molecules that affect nearby target cells.
• Endocrine signalling: Involves hormones secreted by specialized cells that travel through the bloodstream to distant target cells, resulting in a slower and sustained response.
• Autocrine signalling: Occurs when cells release signals that act on the same cell that released them.
• Direct signalling: Involves direct physical contact between cells, typically through gap junctions or other direct mechanisms.

The correct answer is Endocrine signalling, as this process involves hormones traveling substantial distances in the body to elicit responses from cells in different locations, making it a slower yet persistent form of cell communication.