Final answer:
The soleus muscle is located in the leg and is essential for foot flexion at the ankle. It is attached to the calcaneus bone by the Achilles tendon and works with other leg muscles when standing on one's toes.
Step-by-step explanation:
The soleus muscle is located in the leg portion of the body. It is one of the muscles in the back of the lower leg and is important for actions such as standing and walking, as it helps to flex the foot at the ankle joint. The Achilles tendon serves to attach the soleus muscle, along with the gastrocnemius and plantaris muscles, to the calcaneus bone in the foot. When examining which muscle is the largest in the lower leg, the gastrocnemius is typically considered to be larger than the soleus. However, when standing on one's toes, the muscles in the back of the leg, including the soleus, pull the Achilles tendon via a simplified lever system.