A Regular Rhythm Is One in Which the R-R Intervals

question 13

Multiple Choice

A regular rhythm is one in which the R-R intervals

• A)Vary by only one or two little blocks.
• B)Do not vary at all.
• C)Are the same as the P-P intervals.
• D)Are interrupted by premature beats.

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Definitions:

Calmodulin

Protein receptor for Ca2+ that plays a role in many Ca2+-regulated processes, such as smooth muscle contraction.

Steroid Hormones

Lipid-soluble molecules derived from cholesterol that regulate a variety of physiological functions including metabolism, inflammation, and sexual function.

Plasma Membrane

The lipid bilayer that surrounds a cell, controlling the passage of substances in and out of the cell.

Phosphodiesterase

Enzyme that splits phosphodiester bonds—that is, that breaks down cyclic AMP to AMP.