There are 3 parts to the Medical.
Part 1 consists of a health questionnaire, vision test, colour vision test, hearing test, urine sample, pulse, blood pressure, height and weight. (I'm working from memory, so I may have missed something). All of this is recorded on a single form, which stays with the medic.
Part 2 consists of a followup to any areas identified during the Part 1. For instance,, if you had broken your arm as a young child, you would have indicated that on the questionnaire, and the PA would then ask you questions about the details of the break, which arm, where, when and see if there is any residual effects.
During Part 2 the PA may decide that there is a need for further medical information. You would be given a form to have your family doctor to provide the details that are required for the medical staff to make a decision on medical suitability.
Part 3 consists of sending the entire file to Ottawa, where the medical staff reviews the recommendations of the PA, and authorizes the medical.