4 Key Muscles of the Human Body: Location & Function

1. Biceps brachii: Located on the front of the upper arm, the biceps brachii muscle is responsible for flexing the elbow and supinating the forearm.

2. Triceps brachii: Located on the back of the upper arm, the triceps brachii muscle is responsible for extending the elbow.

3. Quadriceps femoris: Located on the front of the thigh, the quadriceps femoris muscle is responsible for extending the knee and flexing the hip.

4. Gluteus maximus: Located on the back of the hip, the gluteus maximus muscle is responsible for extending the hip and externally rotating the thigh.