Musculoskeletal System | Sarcomere Structure: Actin & Myosin скачать в хорошем качестве

Musculoskeletal System | Sarcomere Structure: Actin & Myosin

Official Ninja Nerd Website: https://ninjanerd.org Ninja Nerds! In this lecture, Professor Zach Murphy will present on the structure of the sarcomere, the fundamental contractile unit of skeletal muscle. We begin by exploring the arrangement of thick and thin filaments, focusing on myosin as the significant component of the thick filament and actin as the core of the thin filament. You will learn how regulatory proteins like tropomyosin and troponin control the exposure of actin’s myosin-binding sites, and how structural proteins such as titin anchor myosin to the Z-discs, providing both elasticity and stability within the sarcomere. We then detail the organization of the sarcomere into distinct regions, including the A band, I band, H zone, M line, and Z line, and explain how these zones shift during muscle contraction and relaxation. The lecture also covers the molecular interactions during the cross-bridge cycle, emphasizing how ATP binding, hydrolysis, and release drive the myosin head movements that slide actin filaments past myosin filaments. Finally, we integrate these structural concepts into the broader context of muscle physiology, showing how the precise arrangement of actin and myosin enables efficient force generation and coordinated contraction. Enjoy the lecture and support us below! 🌐 Official Links Website: https://www.ninjanerd.org Podcast: https://podcast.ninjanerd.org Store: https://merch.ninjanerd.org 📱 Social Media   / ninjanerdlectures     / ninjanerdlectures     / ninjanerdlectures   https://x.com/ninjanerdsci/   / ninja-nerd   💬 Join Our Community Discord:   / discord   #ninjanerd #SarcomereStructure #Musculoskeletal