A Bit of Dust Blows into and Touches the Cornea

question 7

Multiple Choice

A bit of dust blows into and touches the cornea of the eye. Which of the following is likely to ha ppen?

• A) Nothing, because there is no sensory information sent from the cornea.
• B) Stimulation of the facial nerve (VII) will be perceived as pain.
• C) Stimulation of the optic nerve (II) will cause tears to flow from the lacrimal gland.
• D) Stimulation of the ophthalmic division of the trigeminal nerve (V) will cause blinking.

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Definitions:

Teratogens

Agents that can cause developmental abnormalities or birth defects in a developing fetus when exposed to the mother.

Zygotes

The initial cell formed when a new organism is conceived, produced by the union of sperm and egg cells.

Deoxyribonucleic Acid

The molecule that carries the genetic instructions used in growth, development, functioning, and reproduction of all living organisms.

Dizygotic

Pertaining to or derived from two separate fertilized ova, leading to fraternal twins.