To reach the nasal cavity, a droplet of lacrimal secretion does NOT HAVE to pass

Question

To reach the nasal cavity, a droplet of lacrimal secretion does NOT HAVE to pass through...

A. ductules of the ipsilateral lacrimal gland

B. a superior lacrimal canaliculus

C. a nasolacrimal duct

D. a lacrimal sac

E. all of the above

#2 Which item is FALSE:

A. cones are more sensitive to light than rods

B. the impulses generated by rods result in black/white/shades of gray vision only

C. both rods and cones can regenerate the "cis" forms of their visual pigments in absolute darkness

D. rods outnumber cones in most parts of the retina

E. At "normal" light levels, rods are dysfuntional

Explanation / Answer

To reach the nasal cavity, a droplet of lacrimal secretion does NOT HAVE to pass through...

ANSWER- E. all of the above

the tears secreted in the lacrimal gland then passes through the superior lacrimal punctum, superior lacrimal canal, inferior lacrimal punctum, inferior lacrimal canal into the lacrimal sac, then through the nasolacrimal canal into the nasal cavity.

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#2 Which item is FALSE:

ANSWER- A. cones are more sensitive to light than rods

EXPLANATION- Rods are responsible for dark vision and cones are responsible for bright light and colour vision. hence rods are more sensitive to light than cones.

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