What are the 4 basic steps in the sliding filament theory?
What are the 4 basic steps in the sliding filament theory?
In the sliding filament theory, myosin heads attach to an actin filament, bend to pull the actin filaments closer together, then release, reattach, and pull again.
How does sliding filament theory occur explain your answer?
According to the sliding filament theory, a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber. When all the sarcomeres in a muscle fiber shorten, the fiber contracts.
What are the 6 steps of the sliding filament theory?
Terms in this set (6)
- The sarcoplasmic reticulum stimulated to release calcium ions.
- Calcium ions bind to troponin.
- Cross bridges (on myosin) pull on actin (power stroke)
- Cross bridge detaches from binding sites on actin.
- Muscle fiber lengthens & relaxes.
- Calcium ions actively pumped back into sarcoplasmic reticulum.
What is meant by all or none law?
The all-or-none law is a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.
What does the sliding filament theory describe quizlet?
The sliding filament theory is the explanation for how muscles contract to produce force. The actin and myosin filaments within the sarcomeres of muscle fibres bind to create cross-bridges and slide past one another, creating a contraction.
What are the 9 steps of muscle contraction according to the sliding filament theory?
| Order | Brief summary of a muscle contraction | Correct order |
|---|---|---|
| 6 | The action potential causes Ca2+ to be secreted. | 2 |
| 7 | Myosin heads tilt towards the center of the sarcomere (power stroke). | 7 |
| 8 | A new ATP molecule binds with the Myosin | 9 |
| 9 | Tropomyosin complex (which blocks the binding sites on actin) moves/changes | 4 |
What is staircase phenomenon?
Introduction. The Bowditch effect is also known as the Treppe phenomenon, staircase phenomenon, or frequency-dependent activation. It refers to the idea that an increase in heart rate increases the force of contraction generated by the myocardial cells with each heartbeat despite accounting for all other influences.
What does the sliding filament model describe during muscle contraction?
The sliding filament model describes the process used by muscles to contract. It is a cycle of repetitive events that causes actin and myosin myofilaments to slide over each other, contracting the sarcomere and generating tension in the muscle.
What role does ATP play in the sliding filament process quizlet?
ATP transfers its energy to the myosin cross bridge, which in turn energizes the power stroke. 2. ATP disconnects the myosin cross bridge from the binding site on actin. 3.
