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Urine Transport - Micturition reflex and urination...

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Urine Transport, Storage, and Elimination Urine production ends with fluid entering the renal pelvis •Rest of urinary system transports, stores and eliminates •Ureters •Bladder •Urethra The ureters •Pair of muscular tubes •Extend from renal pelvis to the bladder •Peristaltic contractions force urine toward the urinary bladder The urinary bladder •Hollow, muscular organ •Reservoir for the storage of urine •Contraction of detrusor muscle voids bladder •Internal features include •Trigone •Neck •Internal urethral sphincter •Ruggae The urethra •Extends from the urinary bladder to the exterior of the body •Passes through urogenital diaphragm (external urinary sphincter) •Differs in length and function in males and females
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Unformatted text preview: Micturition reflex and urination •Urination coordinated by micturition reflex •Initiated by stretch receptors in wall of bladder •Urination requires coupling micturition reflex with relaxation of external urethral sphincter Aging and the Urinary System Changes with aging include: You should now be familiar with: •The components of the urinary system and their functions •The location and structural features of the kidneys •The structure of a nephron, and the processes involved in the formation of urine •The normal characteristics, composition, and solute concentrations of a representative urine sample...
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