
Tem Of A Section Through Striated Muscle

by Steve Gschmeissner/science Photo Library
Title
Tem Of A Section Through Striated Muscle
Artist
Steve Gschmeissner/science Photo Library
Medium
Photograph - Photograph
Description
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. The fibrils run in parallel (from left to right) and between them runs sarcoplasmic reticulum (SR) that transmits nerve impulses to the fibrils. Here, the SR contains many mitochondria (brown). Within each fibril are contractile units called sarcomeres, separated by red lines. A sarcomere has protein filaments of myosin (pink) and actin (yellow) that slide over each other, thereby causing the whole muscle to contract. Skeletal muscle is responsible for voluntary muscle movement in the body. Magnification: x10,000 when printed at 10 centimetres wide.
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September 12th, 2018
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