Second, cardiac muscle fibers are branched and interconnected. When the pacemaker cells generate an impulse, it spreads in an organized, wavelike pattern, which facilitates the beating of your heart.

A method of examining a small (50 to 100 µ o.d.) strand of living cardiac muscle containing several fibers with a high power optical system is described. When the strand was stretched so that it was ...

Isolated cardiac trabeculae are convenient specimens with which to study the properties of cardiac muscle under a variety of controlled conditions in vitro. We have developed an instrument for ...