Examlex
Under a system of positive control,transcription does not occur unless a regulator molecule directly stimulates RNA production.
Angina Pectoris
A condition marked by severe chest pain due to insufficient blood supply to the heart, often a symptom of coronary artery disease.
To Choke
To experience difficulty breathing because of a constricted or obstructed throat or lack of air.
Sinoatrial Node
The heart's natural pacemaker, a small, specialized cluster of cells located in the right atrium that regulates the heart’s electrical impulses and hence its beating.
Atrioventricular Node
A part of the cardiac conduction system that controls the heart rate by delaying the transmission of electrical impulses from the atria to the ventricles.
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