Answer Happy

13) Detection of small differences in visual stimulus contrast would be worst at which of the following temporal frequencies? a) 5 Hz b) 10 Hz c) 15 Hz d) 20 Hz e) 35 Hz 14) Weak electric fields are detected by sharks using which structures? a) Photoreceptors b) Ampullae of Lorenzini c) Ossicles d) Cryptochromes e) Neuromasts 15) In cetaceans (dolphins, whales, etc.), during echolocation the returning echo is captured initially by which structure? a) b) Melon c) Inner ear d) e) Nasal sac Lower jaw Swim bladder 16) The semicircular canals of the dynamic labyrinth in the inner ear detect head using hair cells located on the at the base of each canal. a) linear, saccule b) rotational; striola c) vertical; matrix d) rotational; crista ampullaris e) linear, utricle motion of the 17) Which of the following is not true of the static labyrinth in the inner ear? a) Sensory hair cells are bome on a structure called the macula b) The apical stereocilia of sensory hair cells are embedded in a calcareous gelatinous mass c) Sensory hair cells are arranged in patches with opposing directional sensitivity d) Displacement of the hair cell stereocilia towards the kinocilium causes hyperpolarisation of the hair cell and a reduction in neurotransmitter release e) The hair cells synapse with primary sensory afferent neurons that travel via CN VIII to the brain 18) Sensory afferent fibres from the dynamic and static labyrinths travel to which structure in the brainstem that coordinates balance and equilibrium? a) Vestibular nucleus b) Superior olive c) Inferior colliculus d) Rostral ventrolateral medulla e) Dentate nucleus