MOD9 urine transport p2

what are ureters:

pair of muscular tubes

extend from kidneys to urinary bladder

3 layers of ureter:

inner mucosa

middle muscular layer

outer connective tissue layer

explain peristaltic contractions:

begin at real pelvis, along ureter

forces urine toward urinary bladder

explain the urinary bladder:

hollow muscular organ

temporarily stores urine

explain how bladder position is stabilised

by peritoneal folds

explain ligamentous bands:

anchor urinary bladder to pelvic and pubic bones

explain mucosa of urinary system:

lines urinary bladder

has rugae folds that disappear when bladder fills

explain trigone of urinary bladder:

channels urine into urethra when bladder contracts

explain neck of urinary bladder:

contains internal urethral sphincter

• provides involuntary control of urine discharge

name layers of bladder:

mucosa, submucosa, muscular layer

explain urethra:

transports urine to exterior of body

explain male urethra:

extends from neck of urinary bladder to tip of penis ex

explain lining of urethra in males:

epithelial mucus glands

connective tissues of lamina propria

explain female urethra:

very short

from bladder to vestibule

explain lining of urethra in females:

lamina propria

surrounded by smooth muscle

explain external urethral sphincter

in both sexes

act as a valve

voluntary relaxation permits urination

how does pontine storage centre inhibit urination:

decreasing parasympathetic activity

contracting external urethral activity

explain urine voiding reflex:

urge to urinate appears

causes detrusor to contract and internal and external sphincters relax