composition of urine and elimination of urine

urine is _% water, along with addition components like like urea, uric acid, electrolytes, and amino acids

95%

the volume of urine produced is dependent on fluid intake and what 3 hormones

1. ADH

2. aldosterone

3. ANP

this hormone causes the renal tubules to be more permeable to water

• lowers urine volume

• controls how much water you reabsorb in convoluted tubule

ADH

this hormone stimulates reabsorption of sodium from he renal tubules into the blood

• decrease urine volume

aldosterone

this hormone stimulates secretion of sodium from he blood into renal tubules

• antagonist of aldosterone

• increases urine volume

  • lose sodium → lose water

ANP

these drain the kidneys into the urinary bladder

• peristalsis to drain the kidneys when laying down

ureters

storage for urine

• distensible

urinary bladder

what does distensible mean

can be stretched

the wall of the urinary bladder contains _ that squeezes for emptying

detrusor muscle

this drains the urinary bladder

• shorter in females

urethra

UTIs are caused by _ bacteria crawling up the urethra

coliform

in males, the urethra is part of both _ systems

urinary and reproductive systems

micturition means

urination

micturition is triggered by reflex when

the walls of the bladder is stretched

circular band of muscle in the urethra

• made of smooth muscle (involuntary)

  • gives URGE to go

internal urethral sphincter

band of muscle that is made of skeletal muscle (voluntary)

• consciously relax this to release urine form body

• can lose this control with old age or spinal cord injury

external urethral sphincter

one or both of the urethral sphincters won’t open so you retain urine

• urine builds up so you have to get a catheter

urinary retention (Ischuria)

one or both of urethral sphincters won’t close

• unintentional urine loss caused by stroke, spinal cord injury, old age

urinary incontinance