Examlex
Tiny packets of energy which travel at the speed of light are known as ____.
Retinas
The light-sensitive layer of tissue at the back of the eye that converts light rays into neural signals that are sent to the brain for visual recognition.
Melatonin
A hormone that regulates the sleep-wake cycle, produced by the pineal gland in response to darkness.
Pineal Gland
A small endocrine gland in the vertebrate brain that produces and regulates some hormones, including melatonin, which affects sleep patterns.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles and is often used to treat sleep disorders.
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