MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Young boy's ear. Close-up of the ear of a 5-year-old boy. The ear functions include aiding directional hearing and radiating heat from the head through surface blood vessels (some seen at upper centre). Ear wax (cerumen) is a yellow-brown waxy substance secreted from the ear canal to protect and lubricate the skin.
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