Question

Hinge joints:
A) Are synovial joints
B) Permit movement in one direction
C) Are found in knee
D) All of the above

Answer 1

Hint: Joints are the junctions or part of the bodies where two bones connect or articulate. It is through these parts that the body performs various functions. Based on the type of movement they show, joints are classified into various categories.

Complete Step by Step Answer:
Hinge joints are the type of joints which allow movement in one plane only. It does not allow side-to-side motion but permits flexion and extension in the sagittal plane. For example the joints between the phalanges of the fingers. The name hinge has been probably derived from the hinges of the door, which allow the movement in one plane.

It is a synovial joint. It has two bones connecting each other, wrapped around by cartilage in a viscous fluid: synovial fluid. This allows free mobility of the joints.

Another example of a hinge joint is the knee. The patella situated between femur and tibia, allows bending of the leg as a whole at this junction.

Other examples include: Tibiotalar joint of ankle, elbow.

Thus, the correct answer is D: All of the above.

Note: Synovial joint acts as a greasing agent. If it decreases in quantity, it becomes hard for the individual to move. On the other hand, if it increases more than required, that part of the body swells up and makes it stiff.
The sagittal plane divides the body into two equal halves: left and right.