Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
6 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Role of:
-Myosin -Actin -Tropomyosin -Troponin -Calcium -ATP |
.
|
|
|
|
Role of:
-Myosin |
myosin molecules are composed of a head, neck, and tail domain.
The head domain binds the filamentous actin, and uses ATP hydrolysis to generate force and to "walk" along the filament towards the barbed (+) end |
|
|
|
Role of:
-Actin |
myosin molecules are composed of a head, neck, and tail domain.
The head domain binds the filamentous actin, and uses ATP hydrolysis to generate force and to "walk" along the filament towards the barbed (+) end |
|
|
|
Role of:
-Tropomyosin |
Tropomyosin wrap around actin like a slinky. It functions to block myosin from attaching to actin
|
Normally in resting phase, when the muscle is relaxed, the troponin complex is blocking the myosin-binding site.
|
|
|
Role of:
-Troponin |
Troponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle, tropomyosin blocks the attachment site for the myosin crossbridge, thus preventing contraction. When the muscle cell is stimulated to contract by an action potential, calcium channels open in the sarcoplasmic reticulum and release calcium into the sarcoplasm. Some of this calcium attaches to troponin, causing a conformational change that moves tropomyosin out of the way so that the cross bridges can attach to actin and produce muscle contraction.
|
|
|
|
Role of:
-Calcium |
Troponin is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. In a relaxed muscle, tropomyosin blocks the attachment site for the myosin crossbridge, thus preventing contraction. When the muscle cell is stimulated to contract by an action potential, calcium channels open in the sarcoplasmic reticulum and release calcium into the sarcoplasm. Some of this calcium attaches to troponin, causing a conformational change that moves tropomyosin out of the way so that the cross bridges can attach to actin and produce muscle contraction.
|
|
