micturation

Question 1

urine formed in the

Answer 1

nephrons

Question 2

from nephrons, urine drains into

Answer 2

papillary ducts in renal papillae of the renal pyramids

Question 3

where does urine drain into after papillary ducts

Answer 3

cup-like structures called major and minor calyces

Question 4

after major calyces where does urine drain into

Answer 4

renal pelvis then out to bladder through ureters

Question 5

discharge of urine from urinary bladder is

Answer 5

micturation

Question 6

what happens when volume in bladder exceeds 00-400ml

Answer 6

stretch receptors in bladder stimluated and send nerve impulses to spinal cord

Question 7

describe micturation reflex in infants

Answer 7

contraction of detrusor muscle, relaxation of internal urethral sphincter

Question 8

what contracts/relaxes during micturation

Answer 8

bladder/detrusor muscle contracts

both interla & external urethral sphincters relax

Question 9

whats the difference in the sensory impulses that bring about the micturation reflex in adults & children

Answer 9

children reflex transmits nerve impulses to spinal cord

adults reflex transmits nerve impulses to brain - creates conscious awareness

Question 10

adult can consciously inhibit what re micturation

Answer 10

reflex contraction of bladder wall/relaxation of internal sphincter, and control external urethral sphincter & pelvic floor muscles