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Free-floating, photosynthetic, unicellular protists include
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.
Sinoatrial Node
A group of cells located in the right atrium of the heart that spontaneously generates electrical impulses, acting as the heart's natural pacemaker.
Heart Rate
The number of heartbeats per minute, a vital sign indicating the heart's activity.
Heart Attack
A medical emergency where the blood supply to the heart is suddenly blocked, causing damage to the heart muscle.
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