Final answer:
a) Abduction is the muscular action that moves a part of the body away from its median plane. It is the lateral movement of a limb away from the midline of the body. For example, raising the arm at the shoulder joint and moving it laterally away from the body is abduction.
Step-by-step explanation:
Abduction is the muscular action that moves a part of the body away from its median plane. It is the lateral movement of a limb away from the midline of the body. For example, raising the arm at the shoulder joint and moving it laterally away from the body is abduction. Spreading the fingers or toes apart is also abduction.