Word Count : 571

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i) Pineal gland: The pineal gland is a small endocrine gland located in the brain. Its primary function is to secrete the hormone melatonin, which regulates the body's circadian rhythm or sleep-wake cycle. Melatonin secretion increases in darkness and decreases in light, helping maintain normal sleep patterns. The pineal gland also influences reproductive functions, seasonal biological rhythms, and acts as an antioxidant by protecting cells from oxidative stress. ii) Cochlea: The cochlea is a spiral-shaped structure of the inner ear responsible for hearing. It contains the organ of Corti with specialized hair cells that convert ________ ____ ___ _______ ___ _________ ______ _______ __________.
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