★ Eye and Ear Quiz
What part of the eye controls how much light enters the black hole (pupil) in the center of the eye?
A. optic nerve
B. pupil
C. cornea
D. iris
Select your answer:

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Musculoskeletal System › ViewWhich word best describes: an action carried out intentionally
A. Involuntary
B. Voluntary
Neuron Structure › View
Releases neurotransmitters
A. dendrites
B. cell body
C. axon
D. axon terminals