Picture of the Day: Our heart, magnified


Heart muscle cells (shown in green), regress to a more youthfulstate after injury, start dividing again (indicated by a red marker) to replenish lost cells and then mature a second time into cardiomyocytes.

Heart muscle cells (shown in green), regress to a more youthful
state after injury, start dividing again (indicated by a red marker) to replenish lost cells and then mature a second time into cardiomyocytes.

Heart muscle cells (shown in green), regress to a more youthful
state after injury, start dividing again (indicated by a red marker) to replenish lost cells and then mature a second time into cardiomyocytes.

Cardiac muscle consists of interlacing bundles of cardiomyocytes (muscle cells). Like skeletal muscle it is striated with narrow dark and light bands, due to the parallel arrangement of actin and myosin filaments that extend from end to end of each myocyte.

 

Photo courtesy Dr. Juan Carlos Izpisúa Belmonte/ Salk Institute for Biological Studies

 

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