Sarcomere Collection

Heart muscle, confocal light micrograph
Heart muscle. Confocal light micrograph of a section through cardiac (heart) muscle. Cardiac muscle consists of branching elongated muscle cells

Cardiac muscle, TEM
Cardiac muscle. Coloured transmission electron micrograph (TEM) of cardiac muscle fibrils (orange)from a healthy heart. Mitochondria (pink) supply the muscle cells with energy

Cardiac muscle and capillary, TEM
Cardiac muscle. Coloured transmission electron micrograph (TEM) of cardiac muscle fibrils (purple)from a healthy heart. Mitochondria (green) supply the muscle cells with energy

Sugar uptake in muscles, diagram
Sugar uptake in muscles. Diagram showing sugar from a drink (upper right) being taken up by the muscles of the human body

Human muscle fibres, diagram
Human muscle fibres. Diagram showing the structure of human muscles from the cellular to the macroscopic level. At lower right, muscle cells contain many myofibrils

Skeletal muscle fibre. Coloured scanning electron micrograph (SEM) of skeletal muscle fibre. This type of muscle is striated

Skeletal muscle, TEM
Skeletal muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through skeletal, or striated, muscle

Cardiac muscle. Coloured scanning electron micrograph (SEM) of heart (cardiac) muscle fibrils (yellow). The membrane around the muscle has been torn (yellow)

Coloured TEM of a section through striated muscle
Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding- pattern of the muscle fibrils is seen

Cardiac muscle, SEM
Cardiac muscle. Coloured scanning electron micrograph (SEM) of a bundle of cardiac muscle fibrils (green) from a healthy heart. Mitochondria (round, orange) supply the muscle cells with energy

Muscle structure, artwork
Muscle structure. Computer artwork showing the protein structure of myofibrils and how they are bound together to form muscle fibres

Muscle fibre, SEM
Muscle fibre. Coloured scanning electron micrograph (SEM) of a freeze-fractured skeletal (or striated) muscle fibre. The fracturing of the fibre has revealed that it consists of a bundle of smaller

Heart muscle fibres, SEM
Heart muscle fibres. Coloured scanning electron micrograph (SEM) of cardiac muscle fibrils (pink) from a healthy heart. The muscle fibrils, or myofibrils

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The sarcomere, the fundamental unit of muscle contraction, is a microscopic marvel found in various types of muscles throughout the body. In the heart muscle, this intricate structure can be visualized under a confocal light micrograph or through transmission electron microscopy (TEM). The TEM images reveal the highly organized arrangement of sarcomeres within cardiac muscle fibers and their close association with capillaries that supply vital nutrients. Understanding sugar uptake in muscles becomes clearer when examining diagrams illustrating this process. These illustrations demonstrate how glucose is transported into skeletal muscles to provide energy for movement. TEM images further showcase the detailed organization of sarcomeres within skeletal muscle fibers, highlighting their role in generating force and facilitating voluntary movements. Not limited to skeletal muscles alone, cardiac muscle also exhibits an abundance of sarcomeres as seen through TEM and scanning electron microscopy (SEM) techniques. These high-resolution images capture the unique structural features present in cardiac tissue, emphasizing its ability to contract rhythmically and pump blood efficiently. Intriguingly, human muscle fibers exhibit distinct characteristics when depicted diagrammatically. These diagrams help us comprehend the diversity among different types of muscle fibers based on factors such as size, composition, and function.