Movement that turns the palms up is called
a) supination b) extension c) pronation d) inversion
The correct answer and explanation is:
The correct answer is a) supination.
Supination is the movement that turns the palms up or forward, as in the position of the hands when holding a bowl of soup. It involves rotating the forearm so that the radius and ulna (the two bones of the forearm) are parallel to each other. This is the opposite of pronation, which is the movement that turns the palms down or backward.
Supination is an essential movement for various daily activities, such as holding objects, typing, or using utensils. It is also important in certain exercises and sports where the position of the hands affects performance. For instance, in weightlifting, supination can be used in exercises like bicep curls to target the muscles more effectively.
In anatomy, supination can be contrasted with pronation. Pronation occurs when the palm faces downward, and the forearm bones cross over each other, resulting in the palm facing backward. These two movements, supination and pronation, are critical in the functioning of the upper limbs, especially the hands and forearms.
Additionally, terms like extension and inversion refer to different types of movements. Extension refers to increasing the angle between two body parts, such as when straightening the elbow or knee. Inversion, on the other hand, refers to the movement of turning the sole of the foot inward.
Supination is typically involved when performing tasks that require lifting or turning an object in a specific direction, as it provides a more stable and controlled position for the hand and wrist.