ऑब्जेक्ट डायग्राम एंड आंसर द फॉलोइंग क्वेश्चन
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1) Excretory system
2) Urinary bladder and Urethra
3) Ureter , These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys. If urine backs up, or is allowed to stand still, a kidney infection can develop.
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