Exam 4: Urinary System
Which structure(s) is/are confined to the renal medulla?
The thin segments of the nephron loop (loop of Henle.)
T/F: The internal urethral sphincter is composed of smooth muscle and is under involuntary control.
True
T/F: Urine flows from the kidney to the bladder by gravity and peristalsis.
True
Ladderlike looping blood vessels within the medulla.
Vasa Recta
Which of the following is not normally found in urine?
glucose
blood vessels that absorb solutes from the convoluted tubules.
peritubular capillaries
The oblique entry of the ureters into the bladder __________.
prevents backflow of urine into the ureters from the urinary bladder
Which section of the renal tubule is most active in secretion and resorption? What type of epithelium is located in this region?
proximal convoluted tubule; simple cuboidal epithelium with long microvilli
Where does the kidney filter the blood?
renal corpuscle
Where does filtration of the blood occur within the kidneys?
renal cortex
Where are the renal columns located?
renal medulla
Before it enters the ureter, urine collects in the
renal pelvis
The region in the urinary bladder, defined by the openings of the ureters and the urethra, is called the__________ .
trigone
Identify the correct direction of urine flow from formation to exiting the kidney.
Cortex, medulla, renal pelvis, ureter
When full, an adult urinary bladder contains about __________ of urine.
500 ml
Eventually, throughout the uriniferous tubules, about__________ % of fluid is resorbed into the blood
99
Where does blood flow immediately after it leaves the glomerulus in the renal corpuscle?
efferent arteriole
T/F: A network of peritubular capillaries surrounds the convoluted tubules and nephron loop for the purpose of filtration.
False
Where does the ureter penetrate the kidney?
Hilum
The external urethral sphincter is located
at the urogenital diaphragm.
Which of the following portions of the nephron is found in both the renal cortex and medulla?
collecting duct
The function of the collecting duct is to
determine the final volume and concentration of urine.
Contraction of the bladder's__________ muscle squeezes urine from the bladder during urination.
detrusor
Which urethral sphincter is innervated by somatic (voluntary) motor neurons?
external urethral sphincter
Name the strong transparent covering that encases the kidney. -strong dense connective tissue
fiborous capsule
Which vessels in the nephron function in filtration?
glomerular capsule
The microvilli along the luminal surface of the proximal convoluted tubule __________.
increase the total surface area of proximal convoluted tubules and maximize their capacity for resorbing water, ions, and solute from the filtrate
