Fichas
The sliding Filament Theory
Fichas del conjunto (12)
- 1What happens to a contracting sarcomere?The I-band shrinks
- pulling the Z-line and A-band together
- The H-zone also shrinks - 2What is Troponin?Molecules that are bound to tropomyosin. Which contain calcium ion binding sites.
- 3Where is Tropomyosin found?It wound around the actin
- 4What is the first stage of the Sliding Filament Theory?Relaxed muscle
- tropomyosin blocks the binding sites on the actin filaments.
- prevents myosin and actin binding together, so contraction is impossible - 5What is the second stage of the Sliding Filament Theory?Nerve impulses stimulate the release of calcium ions - from the sarcoplasmic reticulum
- 6What is the third stage of the Sliding Filament Theory?High concentrations - calcium ions bind to troponin. This causes the tropomyosin to change shape, exposing the actin binding sites
- 7What is the forth stage of the Sliding Filament Theory?The activated myosin heads bind to the actin filament, producing tension in the muscle
- 8What is the fifth stage of the Sliding Filament Theory?Binding to the actin causes myosin heads to change shape. Causing the whole filmanet to be pulled along the actin.
- ADP is now released from myosin heads - 9What is the sixth stage of the Sliding Filament Theory?ATP binds to the myosin heads. This is broken down to produce ADP, Pi and energy. Energy allows the myosin heads to release actin and return to original state
- 10What is the seventh stage of the Sliding Filament Theory?The cycle now repeats.
- dragging the myosin filaments further along the actin
- sarcomere will continue to contract if ATP is present - 11What is the eighth stage of the Sliding Filament Theory?Calcium is actively removed for the sarcoplasm when the muscle no longer stimulates the nerve. Tropomyosin returns to original state.
- 12What is the ninth stage of the Sliding Filament Theory?Bridges are no longer formed between actin and myosin.
With no force holding the fibres together, fibres are pulled apart by antagonistic muscle action
Información
- Descripción
- A-level Year 13 - Applied Science Fichas sobre The sliding Filament Theory , creado por Astrid Mifsud el 21/11/2017.
- Creado por
- Astrid Mifsud
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- 14
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