Final answer:
The muscles performing hip flexion include the iliopsoas group, rectus femoris, and sartorius. The gluteus maximus extends the hip, whereas the gluteus medius and minimus are involved in thigh abduction.
Step-by-step explanation:
The muscles that perform flexion at the hip joint include the iliopsoas group, which consists of the psoas major and iliacus, and is the primary hip flexor. Additionally, the rectus femoris muscle, part of the quadriceps femoris group located on the anterior aspect of the thigh, also aids in hip flexion. The sartorius is another muscle that flexes the hip; it is a long, band-like muscle extending from the anterior superior iliac spine to the medial side of the proximal tibia. Therefore, the correct answers are the iliopsoas group, rectus femoris, and sartorius.
It is important to note that the gluteus maximus is known for extending the hip rather than flexing it, and the gluteus medius and gluteus minimus muscles are primarily involved in abducting the thigh at the hip joint.