Final answer:
The patient is in the supine position, a standard medical term for lying face up, often used in examinations and surgeries.
Step-by-step explanation:
When a patient is lying face up with feet flat and knees bent, he or she is in the supine position. This term describes a patient who is lying on their back as opposed to the prone position, where the patient would be face down. The supine position is commonly used in various medical settings, including during physical examinations and certain surgical procedures. Knowing these positions is crucial as they provide a standard method of describing a patient's posture during assessment or treatment.