The quads are responsible for extending the knee joint, while the hamstrings are responsible for flexing the knee joint. Together, they work in opposition to produce movement and stabilize the knee during activities like walking, running, and jumping.
It is the rectus femoris, which along with the action of knee extension, it also flexes the hip
knee flexion and hip extension.Biceps femoris also: knee external rotation and hip external rotation.Semi tendinosus and Semi membranosus also: knee internal rotation and hip internal rotation.hamstrings eccentric contraction causes knee extension and hip flexion, whilst the antagonist muscles are passive.
The muscles used in the leg press exercise are your Quads primarily. Hamstring gets a good work out too.
Flexion, abduction, and lateral rotation at the hip, and flexion and medial rotation at the knee.
The main action of the quadriceps or "quads" is walking. This muscle helps straighten the knee and maintain posture. Without this muscle, running, walking, and even standing would be quite impossible.
The rectus femoris THe regular Muscle Action is hip flexion with knee extension, as in kicking a ball or doing a straight leg raise The reverse muscle action is still hip flexion with knee extension, but as in doing sit-ups while lying supine with knes straight ahead
You use the front of the hip (hip flexors) Abdominals and quads (top of the thigh)
The joint above the knee is the hip joint, and the joint below the knee is the ankle joint.
Flex and abduct hip, flex and medially rotate the knee, thus attaining 'tailors' sitting position.
Vertebral Foraminal Entrapment on Hip Flexion and Knee Extension
The rectus femoris differs from the other quadriceps muscle in that it crosses both the hip and the knee joints. Thus, it causes both flexion of the hip and extension of the knee.