Question

numbers 1 and 2 demonstrate ______.

multiple choice

circumduction and supination

rotation and dorsiflexion

Explanation:

Analyze the movements labeled 1 and 2

Using the Anatomical Terminology knowledge point

• Label 1 shows the right arm moving in a circular path where the distal end of the limb traces a circle while the proximal joint (shoulder) remains relatively stable. This circular movement is called circumduction.
• Label 2 shows the left arm performing the same circular motion, which is also circumduction.
• Therefore, numbers 1 and 2 demonstrate circumduction.

Analyze the movements labeled 3 and 4

• Label 3 shows the palm of the hand rotating to face anteriorly (or upward), which is supination.
• Label 4 shows the palm rotating to face posteriorly (or downward), which is pronation.
• The question specifically asks: "Numbers 1 and 2 demonstrate \_\_\_\_\_\_\_."
• Looking at the options, the first option is "circumduction and supination" (which describes the movements shown in the diagrams: 1/2 represent circumduction, and 3 represents supination).

Answer:

• circumduction and supination (Correct answer)
• rotation and dorsiflexion