- "Muscle Fibers" versus "Myofibrils:" Note that skeletal muscle cells are also known as "muscle fibers" because of their long fiber-like shape (0.001 - 0.01 cm thick but 2 - 12 cm long).

During a severe heart attack many heart muscle cells die and are replaced by scar tissue to stabilize the heart wall.

Mount Sinai’s Cardiovascular Research Institute is sending bioengineered human heart muscle cells and micro-tissues into space for the first time on NASA’s 29 th SpaceX commercial resupply ...