Peristaltic contractions, beginning at the renal pelvis, sweep along the ureter, forcing urine toward the urinary bladder. In a normal, healthy person, how often do these contractions occur?
A) 12-15 times a minute
B) every 30 seconds or so
C) once every minute
D) every 2 minutes
E) It is not known how often these contractions occur.
Answer: B
Anatomy & Physiology
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