The main action of rectus abdominis is.....?Question 4Select one:a.Lumbar extensionb.Contralateral flexionc.Trunk Flexiond.Thoracic extension

Main Action of Rectus Abdominis

The rectus abdominis is a paired muscle running vertically along the front of the abdomen. Its main functions include flexing the spine and stabilizing the pelvis.

1. Trunk Flexion: The primary action of the rectus abdominis is to flex the lumbar vertebrae, bringing the ribcage closer to the pelvis. This movement is crucial during various activities such as sit-ups and crunches.

2. Other Actions: While the rectus abdominis does play a role in stabilizing the pelvis and maintaining posture, its most significant action remains trunk flexion.

Conclusion

Based on this understanding, the correct answer to the question regarding the main action of the rectus abdominis is:

c. Trunk Flexion.