Match what is happening at the myofilament level with respect to the relative de
ID: 32901 • Letter: M
Question
Match what is happening at the myofilament level with respect to the relative degree of cross-bridge formation, at lenfths noted by 1, 2, 3, and 4 in the figure below and how this leads to increased or decreased tension.
Length at 1: (1) low passive, low active, decreased cross-bridge formation (2) optimal force generation with greatest cross-bridge formation (3) overstretching reduces cross-bridge formation even more thereby reducing tension substantially (4) stretching causes decreased cross-bridge formation leading to decreased tension
Length at 2: (1) low passive, low active, decreased cross-bridge formation (2) optimal force generation with greatest cross-bridge formation (3) overstretching reduces cross-bridge formation even more thereby reducing tension substantially
(4) stretching causes decreased cross-bridge formation leading to decreased tension
Length at 3: (1) low passive, low active, decreased cross-bridge formation (2) optimal force generation with greatest cross-bridge formation (3) overstretching reduces cross-bridge formation even more thereby reducing tension substantially
(4) stretching causes decreased cross-bridge formation leading to decreased tension
Length at 4: (1) low passive, low active, decreased cross-bridge formation (2) optimal force generation with greatest cross-bridge formation (3) overstretching reduces cross-bridge formation even more thereby reducing tension substantially
(4) stretching causes decreased cross-bridge formation leading to decreased tension
Explanation / Answer
Length at 1: (1) low passive, low active, decreased cross-bridge formation,
Length at 1: (1) optimal force generation with increasing cross-bridge formation (at the point near to 2)
Length at 2: (2) optimal force generation with greatest cross-bridge formation
Length at 3: (4) stretching causes decreased cross-bridge formation leading to decreased tension
Length at 4: (3) overstretching reduces cross-bridge formation even more thereby reducing tension substantially