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

question 18

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

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Definitions:

HAc

A common abbreviation for acetic acid, a weak organic acid with the formula CH3COOH, known for its sour taste and pungent smell.

K

Symbol for potassium, a chemical element with atomic number 19, essential for various functions in living organisms.

[HA]

May refer to the concentration of hyaluronic acid in a solution, often mentioned in the context of chemical and biological studies or cosmetics formulations.

K

Symbol for potassium, a chemical element and a key electrolyte in the body.