The Circular Muscle of the Iris

question 59

Multiple Choice

The circular muscle of the iris

• A) contracts in response to bright light to produce pupillary constriction
• B) is innervated by the parasympathetic nervous system
• C) contracts to slacken the suspensory ligaments and to increase the strength of the lens during accommodation
• D) contracts in response to bright light to produce pupillary constriction and is innervated by the parasympathetic nervous system
• E) all of these

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Definitions:

Outgroup

In cladistics, a taxon that represents an approximation of the ancestral condition; the outgroup is related to the ingroup (the members of the group under study) but separated from the ingroup lineage before they diversified.

Diverges

Moves or extends in different directions from a common point, or becomes fundamentally different in character or form.

Consortium

An association, typically of several business companies, created to undertake a project that is beyond the resources of any one member.

Barcode

A representation of data regarding the object to which it is attached that is readable by machines, typically used for identification and tracking purposes.