Final answer:
The most common site of bleeding in nosebleeds is the anterior septum.
Step-by-step explanation:
The most common site of bleeding in cases of epistaxis (nosebleeds) is the anterior septum. The nasal cavity is divided into left and right sections by the nasal septum, which is formed by a portion of the septal cartilage at the front and the perpendicular plate of the ethmoid bone and the vomer bones at the back. The anterior part of the nasal septum is a common site for nosebleeds due to its rich blood supply.