Multiple Choice
Which of the following statements about apoptosis is true?
10. Cell Signaling
Types of Cell Signaling
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Paracrine signaling is characterized by signaling molecules (ligands) that are _______:
A
Produced and secreted by the target cell.
B
Secreted by cells close to the target cell.
C
Secreted by nerve cells across a synapse.
D
Secreted by cells far from the target cell.
Verified step by step guidance1
Understand the concept of paracrine signaling: Paracrine signaling involves the release of signaling molecules by cells that affect nearby target cells. This is different from endocrine signaling, where hormones are released into the bloodstream to affect distant cells.
Identify the key characteristic of paracrine signaling: The signaling molecules are secreted by cells that are in close proximity to the target cells, allowing for local communication.
Consider the options provided: Evaluate each option based on the definition of paracrine signaling. The correct option should reflect the local nature of this type of signaling.
Eliminate incorrect options: Remove options that describe signaling over long distances or through specialized structures like synapses, as these do not fit the definition of paracrine signaling.
Select the correct option: Choose the option that accurately describes the secretion of signaling molecules by cells close to the target cell, which is the hallmark of paracrine signaling.
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