Question

The joint in which one of the two bones is fixed in its place and bears a peg-like process over which the other bone rotates is called:
(A)hinge joint
(B)saddle joint
(C)pivot joint
(D)angular joint

Answer 1

Hint: The typical type of joint in which 1 of the two bones is fixed in its place and bears a peg-like process over which the other bone rotates is a type of synovial joint which is also known as a rotator joint.

Complete answer:
The typical joint within which one among the two bones is fixed in its particular place and bears a peg-like process over which the other bone rotates is called pivot joint. In pivot joints, it was seen that the axis of a convex articular surface is parallel with the longitudinal axis of the bone.

Additional Information: A rotary joint is a synovial joint within which the ends of two bones meet—one end being a central bony cylinder, the other end being a hoop (or ring-like structure) made of bone and ligament. In some joints, the cylinder rotates inside the ring or hoop. In other joints, it is opposite i.e the ring rotates around the cylinder. The rotation of the skull is formed possible by a rotary joint.
Pivot joints hold the 2 bones of the forearm together. That is, a rotary joint, which is located near the elbow, joins the bones of the forearm (called the ulna and therefore the radius) to each other. These two bones also are joined to each other near the wrist by another rotary joint. a unique rotary joint, located at the base of the skull, joins the first vertebra of the spine to the second vertebra and thus permits the head to rotate (since the primary vertebra is joined to the skull).
So, the correct answer is ‘pivot joint’.

Note: Rheumatoid arthritis: a typical kind of chronic inflammation of the joints. It causes many problems like swelling, pain, stiffness, elevated temperature, and redness of the joints. It's a disease of connective tissue and destroys bone, cartilage, and ligaments within the joints.