What is ADHD? ADHD (attention deficit-hyperactivity disorder) affects both adults and school-aged children. Symptoms include restlessness, difficulty paying attention, and hyperactivity. The causes of ADHD are unknown, however factors such as diet, environment and genetics may contribute to symptoms.
The knee muscles control how the knee joint and patella move. There are two main groups of muscles, the quadriceps and the hamstrings, as well as a small muscle behind the knee (popliteus).
The semitendinosus is one of the hamstring muscles. It arises or starts from the ischial tuberosity(the bone you sit on) and inserts or connects by a long tendon to tibia (low â¦ er leg bone) just below the medial (inside) side of the knee.here are three main muscles of the posterior compartment of the thigh. They are the biceps Femoris, the semitendinosus and the semimembranosus. Together, they cause flexion â¦ of the knee and extension of the hip. 7 people found this useful.