Final answer:
A health maintenance organization (HMO) is responsible for providing health care services for a fixed fee in a certain area, focusing on comprehensive and preventive care to control costs.
Step-by-step explanation:
The entity responsible for providing health care services to subscribers in a given geographical area for a fixed fee is known as a health maintenance organization (HMO). Unlike a fee-for-service health financing system where providers are reimbursed for each service rendered, an HMO pays a fixed amount per person enrolled in the plan regardless of how many or which services the subscriber requires. HMOs aim to provide comprehensive healthcare to its members while controlling costs through a network of designated providers and emphasizing preventive care.