Examlex
Which one of the following controls the amount of light entering the eye?
Smooth Muscle
A type of muscle found in the walls of internal organs, such as the stomach and blood vessels, that contracts involuntarily.
Calcium-Calmodulin Complex
A complex formed when calcium ions bind to the protein calmodulin, playing a key role in various cellular processes.
Myofibrils
The basic rod-like unit of a muscle cell, composed of sarcomeres, which are responsible for the muscle's contractile properties.
Sarcomeres
The basic contractile units of muscle fiber, defined by the region between two Z lines, responsible for muscle contraction.
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