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Even when the supply of inorganic nutrients to the surface is high, due to for example upwelling, the absolute concentration of nutrients in the surface may still be low.
Pacemaker
An electronic device implanted in the body to regulate the heartbeat, used primarily in conditions where the heart's rhythm is abnormally slow.
Cardiac Conduction
The system of electrical signals that initiate and regulate the heart's rhythm and beat.
Oxygenated Blood
Blood that has been enriched with oxygen in the lungs and is then transported by the arterial system to oxygenate the body's tissue.
Arterioles
Small branches of arteries that lead to capillaries, regulating blood flow and pressure by constricting or dilating.
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