The human skeleton is strong, yet it is relatively light. So, the skeleton weighs about 30 pounds in a 160-pound man. It is perfectly adapted for locomotion and manipulation. An S-shaped spine is responsible for our upright posture, though the pressure placed on the lower back sometimes results in swayback posture and lower back pain. Because we stand upright, we are able to use our hands for manipulation of our environment rather than locomotion, which is reflected in the anatomy of our upper extremities.
Bones come in many sizes and shapes.
Each long bone has the anatomical features described in the Bone Tissue lecture notes, as well as pages 108-109 and Fig. 5.1 in your text. The diaphysis of some of the long bones, like the femur, are slightly curved for strength. A curved bone can absorb the stress of body weight better than a straight bone. In curved bone, the stress of body weight is distributed at several different points so that the pressure of body weight is evenly distributed throughout the bone. The long bones include the bones of the upper arm, forearm, hand, fingers, thigh, lower leg, foot, and toes.