Final answer:
The scaphoid is the carpal bone that fractures easily and is difficult to heal due to poor blood supply.
Step-by-step explanation:
The most commonly fractured carpal bone is the scaphoid, often resulting from a fall onto the hand. Due to the poor blood supply to the scaphoid bone, healing will be slow and there is the danger of bone necrosis and subsequent degenerative joint disease of the wrist.