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Biology : Human Organ Systems III

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_______ is also known as 'voice box'.     1Urethra
Blood is returned to the heart from various body parts through blood vessels known as _______.     2Lungs
_______ is a tubular structure through which urine is excreted out of the body.     3veins
_______ is a sac-like structure which stores urine.     4Larynx
_______ are the main respiratory organs.     5Urinary bladder

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