Muscle cells

Muscle cells, also called muscle fibers, are specialized cells that make up muscles in the body. They have the unique ability to contract and relax, which produces movement and force. These cells contain bundles of proteins called actin and myosin that slide past each other, shortening the cell during contraction. There are different types of muscle cells: skeletal (voluntary movements like walking), smooth (in blood vessels and organs), and cardiac (heart contractions). Muscle cells require a lot of energy and oxygen to function effectively, and they work together in networks to control muscular actions essential for daily activities and vital functions.