Final answer:
The radiocarpal joint of the wrist and the metacarpophalangeal joints of the fingers are biaxial joints that allow for movements such as flexion, extension, abduction, adduction, and circumduction.
Step-by-step explanation:
The radiocarpal joint and the metacarpophalangeal joint are two types of joints found in the human hand. The radiocarpal joint, also known as the wrist joint, is where the radius bone of the forearm meets the carpal bones of the hand. This joint, along with the midcarpal joint, facilitates all movements of the hand at the wrist. The metacarpophalangeal joints, commonly referred to as the knuckle joints, are the points of articulation between the distal ends of the metacarpal bones in the hand and the proximal phalanges of the thumb or fingers.
The radiocarpal joint is responsible for the movement of the hand, allowing for the bending and straightening (flexion/extension), movement toward and away from the body (abduction/adduction), and the circular motion (circumduction) of the wrist. On the other hand, the metacarpophalangeal joints, which operate as condyloid joints,
allow also for flexion/extension and abduction/adduction, enabling the fingers to spread apart and come together, as well as a limited amount of rotation, allowing for circumduction movements.