Question

How is the human head/neck, spine, pelvis, leg, knee, and foot especially suited for walking upright? In other words, how are these features of the human anatomy different from those in an animal that walks on all fours?

Answer 1

The human anatomy, specifically the angling of the femur, spinal curves, and arch in the foot, is specially adapted for walking upright.

Step-by-step explanation:

One of the most important anatomical changes that facilitate successful bipedalism is the angling of the femur (upper leg bone) inward at what is referred to as a valgus angle, which positions the knees and feet under the center of the pelvis. Bipedal hominins have also evolved spinal curves that make it possible for the hips to balance the weight of the upper body. The evolution of the arch in the foot as well as the realignment of the big toe so that it is parallel to the other toes is also instrumental in transmitting weight during the step phase of bipedal locomotion.