K.C.S.E Biology Q & A - MODEL 2001PP1QN17a
State the functions of the following parts of the mammalian ear;
(i) Tympanic membrane
(ii) Eustachian tube
(iii) Ear ossicles
a) i) Tympanic membrane.
Receives sound waves (from the air); and vibrates / transforms sound wave into vibrations to transmit them to the ear osssicles / malleus; acc. Hammer for malleus.
ii) Eustachain tube.
Equalizes the air pressure in the middle ear to that in the outer ear.
iii) Ear ossicles
Amplify / transmits vibrations from the tymphanic membrane in the inner ear / venestra ovalis / oval window.