Final answer:
The greatest output effect of Ib GTO afferents is exerted on antagonistic muscles. Synergists assist agonists in producing movement, and the gluteal group is a major muscle group responsible for hip extension.
Step-by-step explanation:
The greatest output effect of Ib GTO afferents is exerted on antagonistic muscles. Group Ia afferents primarily activate agonistic muscles, while Ib afferents inhibit the same muscles but primarily activate antagonistic muscles to regulate tension and prevent damage. This process involves complex neural pathways where Golgi tendon organs (GTOs) provide feedback to the central nervous system about muscle tension, leading to the adjustment of muscle contraction to avoid excessive force which can cause injury.
Related to the concept of muscle cooperation, a synergist helps an agonist work, by assisting the agonist to perform a movement or by stabilizing joint components. Synergists are important in facilitating smooth and efficient movements by muscles.
Further, the large muscle group that is responsible for hip extension, attached to the pelvic girdle, is known as the gluteal group. This muscle group plays an essential role in various movements, including walking, running, and climbing.