Micturition

• Micturition is also called urination. It is defined as expelling of urine stored in urinary bladder through urethra.
• Kidney filters urine and ureter transport urine into urinary bladder
• When bladder get full, its muscle and sphincter relax and urination occurs
• Governed by nervous and muscular system

It can be explained in two phase:

I. Filling

• Filling of urine into bladder through ureter
• No sphincter in ureter, enter bladder obliquely.

II. Voiding

• Expelling of urine stored in bladder.
• Sphincter and muscle of urethra contract? Relax so that voiding occurs.