| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.HL.TZ1.5 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 5 | Adapted from | N/A |
Question
Approximately 350 000 people worldwide have received cochlear implants. Outline the use of cochlear implants in patients with hearing problems.
State the part of the ear that is responsible for detecting movement of the head.
Describe the role of bipolar cells in the eye.
Markscheme
a. microphone outside the ear pick up sounds
b. sound waves converted to electronic/digital signals
c. electronic impulses sent to electrode in cochlea
d. «electrode» directly stimulates auditory nerve
e. signals «generated by implant» sent to brain which recognizes signals as sound
semicircular canals
a. transmit the signals from the photoreceptors «rods and cones» to the ganglion cells
b. groups of/more than one rod cell synapse with one bipolar cell
c. one cone cell synapses with one bipolar cell
d. once light is absorbed bipolar cell depolarizes
e. activates/depolarizes a ganglion cell
