Q2 Flashcards
(1) Otoliths are crystals of__________ associated with the _______ Calcium carbonate, crista ampullaris Calcium carbonate, macula Calcium phosphate, crista ampullaris Calcium phosphate, macula
carbonate
(2) The structure that separates the cochlear duct from the tympanic duct is the Basilar membrane Stapedius Membranous labyrinth Bony labyrinth Tectorial membrane
Basilar membrane
(3) What fluid is located between the bony and membranous labyrinths within the inner ear? (A) Aqueous humour (B) Endolymph (C) Perilymph (D) Vitreous humour
(C) Perilymph
(5) There are __________ primary taste sensations (A) 2 (B) 5 (C) 12 (D) 20
B) 5
6) A ray of light entering the eye will encounter these structures in which order? (A) cornea → aqueous humor → conjunctiva → lens → vitreous body → retina → choroid (B) vitreous body → retina → choroids → aqueous humor → lens → conjunctiva → cornea (C) conjunctiva → cornea → lens → aqueous humor → vitreous body → retina → choroid (D) cornea → aqueous humor → vitreous body → lens → conjunctiva → choroids → retina (E) conjunctiva → cornea → aqueous humor → lens → vitreous body → retina → choroid
(C) conjunctiva _ cornea _ lens _ aqueous humor _ vitreous body _ retina _ choroid
(7) The following steps occur in rods when they are excited by photons of light. Place them in the correct sequence.
1. Membrane sodium channels close.
2. cGMP is broken down.
3. The membrane hyperpolarizes and the rate of neurotransmitter release declines.
4. Transducin is activated.
5. Opsin is activated.
(A) 5, 4, 2, 1, 3 (B) 4, 5, 2, 1, 3 (C) 3, 5, 2, 1, 4 (D) 1, 5, 2, 4, 3 (E) 1, 3, 4, 5, 2
(A) 5, 4, 2, 1, 3
(8) The oval window is connected directly to which passageway?
(A) external acoustic meatus (B) scala vestibule (C) pharyngotympanic tube (D) scala tympani
(A) external acoustic meatus
(9) A blind spot in the retina occurs where
(A) the fovea is located
(B) rod cells are clustered to form the macula
(C) ganglion cells synapse with bipolar cells
(D) horizontal cells are located
(E) photoreceptors are absent, as the optic nerve leaves the eye
(E) photoreceptors are absent, as the optic nerve leaves the eye
10) The receptor cells for hearing are located on the upper surface of what membrane?
(A) basilar membrane (B) tectorial membrane (C) tympanic membrane (D) vestibular membrane (E) Ressiner’s membrane
(A) basilar membrane
(11) Why is the If current called “funny”?
Normally when hyperpolarisation takes place, ion channels should close but in this case, the If ion channel opens which is unusual and that is why it is referred to as “funny” J
(12) Foliate papillae are located in small trenches on the lateral margins of the tongue and innervated by _______nerve.
(A) V (B) VII (C) IX (D) X (E) XII
C) IX
(13) Bitter receptors are comprised of which family of proteins?
(A) T1R1 (B) T1R2 (C) T1R3 (D) T2R
D) T2R
14) Aqueous humor is secreted by the __________; it flows out of the posterior chamber through the pupil into the anterior chamber where it is reabsorbed at a ring-like blood vessel called the __________.
(A) ciliary muscles, canal of Schlemm
(B) ciliary muscles, Eustachian canal
(C) iris, canal of Schlemm
(D) iris, Eustachian canal
(A) ciliary muscles, canal of Schlemm
(15) Before an olfactory receptor can detect an odorant, it has to
(A) bind to receptors in olfactory cilia
(B) contact a specialized olfactory cell
(C) be transported to the olfactory bulbs
(D) respond to applied pressure
(E) gate open ion channels
) bind to receptors in olfactory cilia
(16) The pigmented portion of the eye that has a rounded opening through which light passes is the
A) cornea B) sclera C) iris D) lens E) retina
) iris
