WGU D203 Anatomy & Physiology Questions and Answers 2026 Update | 100% Correct

WGU D203 Anatomy & Physiology Questions and Answers 2026 Update | 100% Correct Appendicular skeleton - Made up of the bones of the extremities (arms and legs). Appended to the axial skeleton. Axial skeleton - body. Compact bone tissue - Made up of the bones along the center, or axis, of your Forms the extremely hard outside layer of bones, gives bone its smooth, dense, solid appearance. It accounts for about 80% of the total bone mass of the adult skeleton. Spongy bone tissue - Fills part or all the interior of many bones. They are porous like a sponge, containing an irregular network of spaces, much less dense than compact bone. It has a greater surface area than compact bone but makes up 20% of bone mass. Long bones - Consist of a long shaft, are cylinder-like in cross-section, and are (usually) expanded at either end. Act as levers for the skeletal muscles to act upon. Short bones - Equal in width and length. Mainly composed of spongy bones surrounded by a thin layer of compact bone.