Muscle Contraction Steps Flashcards
1
Q
1 in relaxed muscles. Myosin heads are not attached to _
A
Thin actin filaments
2
Q
- In Sarcomeres, distance between _ is at its highest
A
Z discs
3
Q
- _ is energyzed by ATP
A
Myosin head
4
Q
- Head energized and actin ready to _
A
Attach to myosin filaments
5
Q
- Energized myosin head attaches to _
A
Binding site on actin filament
6
Q
Energized myosin head attached to actin binding site forms _ between filaments
A
Actin-myosin cross-bridge
7
Q
- Myosin head releases energy and _
A
Pivots
8
Q
- As a result of myosin head pivot, actin filament _
A
Moves along
9
Q
- After pivot and actin moving, _ becomes weaker
A
Cross-bridge between filaments
10
Q
- Cross-bridge releases and _ is re-energized
A
Myosin
11
Q
- All previous steps repeat many times during _
A
Single contraction
12
Q
- Myosin head _
A
Detaches
13
Q
- In a contracted muscle, actin has been _
A
Pulled inwards
14
Q
- When a muscle is contracted, _ are closer together
A
Z discs
15
Q
Z discs closer together cause muscle to be _
A
Shorter
