When the rounded process of one bone fits into the concave surface of another to allow movement in one plane it is called what type of joint? A. Hinge B. Pivot C. Plane D. Saddle

The correct answer is: A. Hinge.

Explanation:

A Hinge joint can be defined as the joint between two bones where the rounded surface for articulation or attachment  of one bone is integrated or fitted into the concave surface for articulation or attachment of another bone.The two bones get attached in such a way that they are capable of moving in only a single plane.They are capable of undergoing two types of movements which are Flexion and Extension.Flexion can be defined as a type of movement where the angle between the two bones which are articulated at the hinge joint decreases.Extension can be defined as a type of movement where the angle between the two bones which are articulated at the hinge joint increases.An example of a Hinge joint is the Elbow Joint, where the distal terminal of the humerus bone located in the upper arm is articulated to the proximal terminal of the radius and ulna bones located in the forearm.

Yes yes yes very good