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The Rounded Opening of the Iris Through Which Light Enters

question 13

Multiple Choice

The rounded opening of the iris through which light enters the eye is called the ________.


Definitions:

Sleep Deprivation

The condition of not having enough sleep, which can impair cognitive function, mood, and physical health.

Serotonin

A chemical messenger vital for regulating mood, digestion, sleep, and various bodily activities.

Suprachiasmatic Nucleus

A tiny region in the brain's hypothalamus responsible for controlling circadian rhythms, functioning as the body's internal clock.

Sleep Cycles

The progression through various stages of sleep, including REM and non-REM phases, which repeat approximately every 90 minutes.

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