pacemaker[pās′māk-ĕr]

Type:Term

Definitions
1. Biologically, any rhythmic center that establishes a pace of activity.
2. An artificial regulator of rate activity.
3. In chemistry, the substance of which the rate of reaction sets the pace for a series of chain reactions; the rate-limiting reaction itself, in a metabolic pathway, the enzyme catalyzing the slowest or rate-limiting reaction in that pathway.

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