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Physiology
The pineal gland produces melatonin, a hormone that helps regulate sleep-wake cycles. Melatonin is synthesized and released in response to darkness, signaling the body to prepare for sleep.
Orthodontics
The mesiobuccal cusp of the maxillary first molar aligns with the mesiobuccal groove of the mandibular first molar.
Physiology
Answer: 2) The primary type of receptor involved in the sympathetic nervous system's response at the neuromuscular junction is the nicotinic receptor, which is an intrinsic ligand-gated ion channel.