A Bit of Dust Blows into and Touches the Cornea

question 28

Multiple Choice

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

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

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Definitions:

Antigens

Antigens are substances, often foreign, that provoke an immune response in the body, especially the production of antibodies.

Monocytes

A type of white blood cell involved in the immune response, capable of differentiating into macrophages and dendritic cells to combat infection.

Phagocytosis

A cellular process where cells, usually immune cells, engulf and digest particles or pathogens to eliminate them.

Rheumatoid Factor

An autoantibody that is often present in the blood of individuals with rheumatoid arthritis and some other autoimmune diseases or infections.