Final answer:
The ulnar artery supplies blood to organs in the forearm and hand. It parallels the ulna bone and gives off smaller branches along the forearm. At the wrist, it fuses with the radial artery to form the palmar arches.
Step-by-step explanation:
The ulnar artery supplies blood to various organs in the forearm and hand. It is formed at the bifurcation of the brachial artery and parallels the ulna bone. As it travels down the forearm, it gives off smaller branches that supply blood to the lower arm and carpal region. At the wrist, it fuses with the radial artery to form the superficial and deep palmar arches, which supply blood to the hand and digits.