
Glycogen
Nearly all cells contain some amount of glycogen; however, glycogen accumulations are commonly seen in very active cells, such as this cardiac muscle cell. In this electron micrograph, glycogen is present between the bundles of contractile filaments which fill the cytoplasm. 15,000x

Glycogen granules
Nearly all cells contain some amount of glycogen; however, glycogen accumulations are commonly seen in very active cells, such as this cardiac muscle cell. In this electron micrograph, glycogen is present between the bundles of contractile filaments which fill the cytoplasm. 15,000x

Bundles of contractile proteins (myofibrils)
Nearly all cells contain some amount of glycogen; however, glycogen accumulations are commonly seen in very active cells, such as this cardiac muscle cell. In this electron micrograph, glycogen is present between the bundles of contractile filaments which fill the cytoplasm. 15,000x

Mitochondria
Nearly all cells contain some amount of glycogen; however, glycogen accumulations are commonly seen in very active cells, such as this cardiac muscle cell. In this electron micrograph, glycogen is present between the bundles of contractile filaments which fill the cytoplasm. 15,000x