An Individual with a "Double-Jointed" Thumb Can Pull It Back

Multiple Choice

An individual with a "double-jointed" thumb can pull it back towards the wrist much farther than normal. What does it mean to be "double-jointed?"

A) articular cartilage at bone ends is replaced with hyaline cartilage
B) the additional joint present doubles the range of motion
C) greater than normal production of serous fluid lubricates the joint and extends it
D) the joint capsules and ligaments are more stretchy and loose than normal