Muscle Contraction Steps

Question 1

1 in relaxed muscles. Myosin heads are not attached to _

Answer 1

Thin actin filaments

Question 2

1. In Sarcomeres, distance between _ is at its highest

Answer 2

Z discs

Question 3

2. _ is energyzed by ATP

Answer 3

Myosin head

Question 4

2. Head energized and actin ready to _

Answer 4

Attach to myosin filaments

Question 5

3. Energized myosin head attaches to _

Answer 5

Binding site on actin filament

Question 6

Energized myosin head attached to actin binding site forms _ between filaments

Answer 6

Actin-myosin cross-bridge

Question 7

4. Myosin head releases energy and _

Answer 7

Pivots

Question 8

4. As a result of myosin head pivot, actin filament _

Answer 8

Moves along

Question 9

4. After pivot and actin moving, _ becomes weaker

Answer 9

Cross-bridge between filaments

Question 10

5. Cross-bridge releases and _ is re-energized

Answer 10

Myosin

Question 11

5. All previous steps repeat many times during _

Answer 11

Single contraction

Question 12

5. Myosin head _

Answer 12

Detaches

Question 13

6. In a contracted muscle, actin has been _

Answer 13

Pulled inwards

Question 14

6. When a muscle is contracted, _ are closer together

Answer 14

Z discs

Question 15

Z discs closer together cause muscle to be _

Answer 15

Shorter