Eventually the urine is conducted to the body ______ by the urethra.
In the male, the urethra is __1__ centimeters long both urine and __2__.
1) 20 cm, 2) semen
The female urethra is ____ centimeters long and transports only urine.
Voiding or emptying the bladder is called,
Voiding has both voluntary and involuntary components. The voluntary spinchter is the ____ spinchter.
An inability to control this spinchter is referred to as ____.
What is the function of the fat cushion that surrounds the kidneys in life?
Perirenal fat capsules anchor the kidneys to the dorsal body wall in a retroperitoneal position & cushions it against blows.
Kidneys are less securely anchored and drop to a more inferior position.
Why is incontinence a normal phenomenon in the child under 1 1/2 to 2 years old?
Because they have not yet gained muscle control over their external spincter.
What events may lead to incontinence in adults?
Spinal cord injury, emotional problems, bladder irritability, or some other pathology of the urinary tract.
Smooth membrane, tightly adherent to the kidney suface
Portion of the kidney containing mostly collecting ducts
Portion of the kidney containing the bulk of the nephron structures
Superficial region of kidney tissue
Basinlike area of the kidney, continuous with the ureter
A cup-shaped extension of the pelvis that encircles the apex of a pyramid
Area of cortical tissue running between the medullary pyramids
Site of filtrate formation
Primary site of tubular reabsorption
Proximal convulated tubule
Secondarily important site of tubular reabsorption
Distal convulated tubule
Structure that conveys the processed filtrate (urine) to the renal pelvis
Blood supply that directly receives substances from the tubular cells
Its inner (visceral) membrane forms part of the filtration membrane
Explain why the glomerulus is such a high-pressure capillary bed.
1) The bed is fed and drained by arterioles (high-resistant vessels), 2) The afferent arteriole (feeder) is larger in diameter than the efferent arteriole (draining).
How does its high pressure condition aid its function of filtrate formation?
The higher the capillary pressure, the more filtrate will be formed.
What structural modification of certain tubule cells enhances their ability to reabsorb substances from the filtrate?
Their possession of dense microvilli, especially the PCT cells.
Explain the mechanis of tubular secretion, and explain its importance in the urine formation process.
1) Its the process of moving substances (hydrogen, potassium ions, creatinine) from the tubule cells or from the peritubular capillary into the tubule filtrate. 2) It's important for adjusting pH and eliminating substances not already in the filtrate.
Compare and contrast the composition of blood plasma and glomerular filtrate.
1) Blood plasma contains red/white blood cells, blood proteins, glucose, water, nitrogenious wastes, and salt. 2) Glomerular filtrate contains everything blood plasma does without most of the blood proteins.
Trace a drop of blood from the time it enters the kidney via the renal artery until it leaves the kidney through the renal vein.
Renal artery-->segmental artery-->interlobular artery-->arcuate artery-->cortical radiate artery-->afferrent arterioles-->glomerulus-->efferent arterioles-->peritubular capillary bed and vasa recta--> arcuate vein-->interlobular vein-->renal vein
Define juxtaglomerular apparatus.
A region of the nephron that plays an important role in forming concentrated urine. Consists of juxtaglomerular & macula densa cells of the DCT.
Trace the anatomical pathway of a molecule of creatinine (metabolic waste) from the glomerular capsue to the urethra.