In platelet aggregation testing, the second phase of aggregation is most closely associated with release of which substance?

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Multiple Choice

In platelet aggregation testing, the second phase of aggregation is most closely associated with release of which substance?

Explanation:
The second phase of platelet aggregation is driven by the platelets releasing their stored contents, which amplify the response. The key substance released is endogenous ADP from dense granules, which acts on platelet receptors to recruit and activate more platelets, sustaining and intensifying aggregation. While other factors like calcium release and fibrinogen binding play roles in activation and cross-bridging, the hallmark of the secondary wave is ADP released from the platelets themselves.

The second phase of platelet aggregation is driven by the platelets releasing their stored contents, which amplify the response. The key substance released is endogenous ADP from dense granules, which acts on platelet receptors to recruit and activate more platelets, sustaining and intensifying aggregation. While other factors like calcium release and fibrinogen binding play roles in activation and cross-bridging, the hallmark of the secondary wave is ADP released from the platelets themselves.

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