Muscle contraction, artwork
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Muscle contraction, artwork
Muscle contraction. Artwork showing the mechanism for muscle contraction in skeletal and cardiac muscle. At top right troponin (T, C, I) is bound to tropomyosin (red), preventing the myosin head (gold) from forming a crossbridge with the actin filament (green). The propagation of an action potential releases calcium ions (purple) into the muscle cell (bottom right). The calcium ion binds to troponin, changing its shape and exposing the myosin binding site on the actin filament. The binding of actin and mysoin causes the muscle to contract (bottom left). The myosin then binds ATP, which allows it to release the actin and return to the starting position (top left)
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6319147
© FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY
Actin Filament Cardiac Contracting Label Labeled Labelled Labels Mechanism Muscle Contraction Physiological Physiology Skeletal Sliding Tension Text Muscle Cell Protein
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