Question

1. which joint type allows one bone to rotate around another, such as when you shake your head

o\ or when the radius and ulna rotate during supination and pronation of the forearm?
a. hinge joint
b. ball - and - socket joint
c. pivot joint
d. gliding joint

1. where in the body would you find a gliding joint, which allows bones to slide past each other?

a. one bone rotates around another (supination/pronation)
b. one bone moves back and forth like a door hinge (flexion/extension)
c. flat bone surfaces slide over each other with limited movement (wrist/ankle)
d. a rounded bone fits into a cup - shaped socket for full rotation (hip/shoulder)

Explanation:

• For question 13: A pivot joint is characterized by one bone rotating around another. Shaking the head “no” (atlanto - axial joint) and supination/pronation (radioulnar joint) are examples of pivot - joint movements. A hinge joint (like the elbow for flexion/extension), ball - and - socket joint (like hip/shoulder for multi - directional movement), and gliding joint (for sliding) do not match the described rotational movement.
• For question 14: A gliding joint has flat bone surfaces that slide over each other with limited movement. Examples are in the wrist and ankle. Option A is a pivot - joint description, option B is a hinge - joint description, and option D is a ball - and - socket - joint description.

Answer:

1. C. Pivot joint
2. C. Flat bone surfaces slide over each other with limited movement (wrist/ankle)