WORKSHEET: MUSCULAR CONTRACTION
1. Define the following types of contractions:
a. Isometric:
b. Concentric:
c. Eccentric:
2. Using the diagrams on the following page, complete the following:
a. Relaxed sarcomere:
Label following on the diagram of a relaxed sarcomere:
A band, I band, Z line, H zone, Myosin, Actin, Crossbridge
b. Concentrically contracted sarcomere:
Label the sarcomere with the following & list what happens to each during a
concentric contraction:
A Band
I Band
Z Line
H zone
Myosin
Actin
c. Eccentrically contracted sarcomere:
Label the sarcomere with the following & list what happens to each during an
eccentric contraction:
A Band
I Band
Z Line
H zone
Myosin
Actin
Relaxed sarcomere:
Concentrically contracted sarcomere:
Eccentrically contracted sarcomere:
3. Complete the following table. What do you notice happening to the following
structures or areas of a sarcomere during the following types of contractions?
Choose your answers from the following list (these answers can be used more
than once):
Increases, decreases, stays the same, disappears, slides over each other, move
closer, moves further apart
Area/Structure
A Band
I band
H Zone
Actin
Myosin
Z Lines
Concentric
contraction
Eccentric
contraction
Isometric
contraction