The interviewer knows your responsibilities as a medical assistant, considering they may have even helped write the job description. They are looking to hear how you approach your daily tasks. Is your routine something you came up with or is it something you do based on doctor's orders? Start by explaining the first thing you do, including washing hands, getting organized, checking in with doctors, etc. Show that you are conscientious and perceptive.
"Beginning the day, we double-check the schedule. Make sure the office would not have a long-wait time for patients. I double check the beds and make sure all of the tools and equipment is in place and sanitary. Then the first patient comes in and we began our day."