Question

A person is turning a key in a door lock. In which plane and around which axis does movement of the forearm primarily occur when turning the key?

A. Transverse plane around a vertical axis
B. Sagittal plane around a frontal axis
C. Frontal plane around a vertical axis
D. Horizontal plane around a sagittal axis

Answer 1

The movement of the forearm primarily occurs in the sagittal plane around a frontal axis when turning a key in a door lock. option B.

Step-by-step explanation:

The movement of the forearm primarily occurs in the sagittal plane around a frontal axis when turning a key in a door lock. This means that the forearm moves forward and backward in relation to the body, around an axis that runs from side to side.

This movement is known as flexion and extension, which are common movements in the sagittal plane. Flexion occurs when the forearm moves forward, while extension occurs when the forearm moves backward.

For example, when you turn a key in a door lock, you primarily use flexion and extension to move your forearm back and forth.

So Option B.