In Bright Light, Impulses from Sympathetic Neurons Cause a Constriction

question 21

True/False

In bright light, impulses from sympathetic neurons cause a constriction of the pupil due to contraction of the radial muscle fibers of the iris.

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Definitions:

Body Movement

The physical motion of the body or its parts, which can range from voluntary actions, like walking and jumping, to involuntary ones, like respiration.

Cardiac Muscle

A specialized type of involuntary striated muscle found only in the heart, responsible for contracting and pumping blood throughout the body.

Endomysium

A connective tissue covering that surrounds individual muscle cells.

Perimysium

A layer of connective tissue that surrounds muscle fibers, grouping them into fascicles.