Actin and myosin filamentsएक्टिन और मायोसिन तंतु

NCERT Fig 17.3 · interactive diagram

Parts and their functions

• F-actin (F-एक्टिन) — Two helically wound polymers of G (globular) actin.
• Tropomyosin (ट्रोपोमायोसिन) — Two filaments running along the F-actins.
• Troponin (ट्रोपोनिन) — At intervals on tropomyosin; masks active sites at rest; binds Ca²⁺ to unmask them.
• Globular head (गोलाकार शीर्ष) — Active ATPase; binds ATP and actin — forms the cross bridge.
• Short arm (छोटी भुजा) — Joins head to tail; with the head projects as the cross arm.
• Tail (LMM) (पूँछ (LMM)) — Light meromyosin; tails pack together to form the thick filament.
• HMM (HMM) — Heavy meromyosin = head + short arm.
• LMM (LMM) — Light meromyosin = tail.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 17.3. Report a mistake