Bladder – Definition, Function and Diseases

Definition of Bladder and Function Bladder – a muscular, saclike structure in the lower pelvis that serves as a reservoir for the URINE the KIDNEYS produce. In women the bladder is in front of and slightly below the UTERUS. During PREGNANCY the expanding uterus limits the bladder’s ability to expand, accounting for the URINARY FREQUENCY common […]

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Glomerulus – Definition and Function

Definition of Glomerulus and Function Glomerulus – the coiled capillary network within the NEPHRON of the kidney through which BLOOD passes for filtration. Glomeruli are abundant within the KIDNEYS as each kidney contains more than a million nephrons. The walls of the glomerulus are only a few cells in thickness. The glomerular walls are semipermeable, […]

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Kidneys – Definition, Structure and Renal Function

Definition of Kidneys Kidneys are a pair of organs responsible for filtering wastes and excess water from the BLOOD, excreting both from the body as URINE. The kidneys maintain the body’s fluid and electrolyte balances, and also produce hormones that regulate the production of new erythrocytes (ERYTHROPOIETIN (EPO)) and BLOOD PRESSURE (RENIN). With each heartbeat about 20 […]

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Nephron – Definition and Function

Definition of Nephron Nephron – The microscopic functional unit of the kidney. Each kidney contains more than a million nephrons, each of which extends from the renal cortex into the renal medulla in fairly linear fashion. Two elements make up the nephron: the renal tubules and the renal corpuscle. The renal corpuscle contains the GLOMERULUS, the coiled […]

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Ureter – Function and Definition

Definition of Ureter Ureter, in a human organism, is a muscular tube, fairly thick and rigid, that leads URINE from the kidney to the urinary BLADDER. Both of the two tubular structures arise from the renal pelvis and collect the urine from the kidney’s collecting tubules. Both ureters with the inner diameter of 3 or 4 millimeters exit the […]

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Urethra Definition and Function (Male, Female)

Definition of Urethra Urethra – a narrow, somewhat muscular tube that carries URINE from the BLADDER to the outside of the body. The point of exit is the urinary or urethral meatus. The urethral sphincter muscle at the base of the bladder controls the release of urine into the urethra. Once the urethral sphincter relaxes to […]

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Urination – Definition, Normal urination and Normal frequency

Definition Urination The act of passing URINE from the BLADDER, also called uresis or micturition. Urination occurs when the urethral sphincter relaxes at the same time the detrusor muscle that forms the middle layer of the bladder wall contracts, squeezing urine into the URETHRA. The urethra carries the urine to the meatus, its opening on […]

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Urine – Definition and Color of Urine

Definition of Urine Urine – the liquid the KIDNEYS generate to pass wastes and excess fluid from the body. The typical adult makes and passes between 1,500 and 3,000 milliliters (1.5 to 3 liters) of urine every 24 hours. Numerous variables influence the volume and composition, though in general urine is 95 percent water and […]

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