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As the heart beats, friction between the pericardial membranes is prevented by:
Absorption
The process by which one substance takes up another substance through physical or chemical means.
Frequency Values
Numbers that represent the rate at which a periodic or cyclic process occurs, often measured in hertz (Hz).
Hertz
The unit of frequency in the International System of Units (SI), defined as one cycle per second.
Electromagnetic Radiation
A form of energy that is propagated through space or matter, consisting of both electric and magnetic wave components.
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