HISTOLOGY
URINARY SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Urine is moved through the ureters in peristaltic waves. Calmodulin activates myosin light-chain kinase in ureteral smooth muscle, causing contraction and electrical pacemaker cells in the proximal renal pelvis, controlling the frequency of these waves (in humans 1–6 waves per minute).
Detailed explanation-2: -Ureteral peristalsis is the process by which urine is propelled from the kidney to the bladder, and is generated secondary to contraction of the smooth muscles in the wall of the ureter (1).
Detailed explanation-3: -Ureteral peristalsis can be considered as a series of compressive zones, corresponding to waves of active muscular contraction, that move at near-constant speed along the ureter towards the bladder.