Question 7 a) Explain the advantages of the use of the flexible endoscope for investigation of the gastrointestinal tract. b) Name two other medical uses for flexible endoscopes that give similar advantages to the above. [2.3] Completed forms to be made available for external moderation. Question 8 At the heart of a magnetic resonance imaging scanner is a large electromagnet capable of generating strong uniform magnetic fields of around one Tesla or more. a) Describe the effect of this large magnetic field on the protons of the hydrogen nuclei within the molecules that make up tissue. A pulse of radio waves is used to excite these protons to a higher energy state. b) Explain why a precise frequency of radiation is required and how this affects the motion of the proton spins