To throw his frisbee, Kenneth bends his elbow and then straightens his arm. This movement is called:
(1 point)
Responses
adduction and abduction.
adduction and abduction.
rotation.
rotation.
flexion and extension.
flexion and extension.
dorsiflexion and plantar flexion.
flexion and extension.
The movement described, where Kenneth bends his elbow and then straightens his arm, is called flexion and extension. This movement happens at the joint between the upper arm (humerus) and the forearm (radius and ulna).
To arrive at this answer, you can break down the options given and understand their definitions:
- Adduction and abduction: These terms refer to movement towards (adduction) or away from (abduction) the midline of the body. This does not accurately describe the movement of bending and straightening the arm.
- Rotation: Rotation is the movement around an axis, like twisting the arm. This is not the movement described in the question.
- Flexion and extension: Flexion is the bending of a joint, reducing the angle between two bones. Extension is the opposite movement, where the joint straightens or opens up. In this case, flexion and extension accurately describe the movement of bending and straightening the arm.
- Dorsiflexion and plantar flexion: These terms refer to movements of the foot, not the arm. Dorsiflexion is when you pull your foot up toward your shin, while plantar flexion is when you point your toes downwards.
Therefore, the correct answer is flexion and extension.