In mammals,the urinary bladder opens into the ........

What will happen if the stretch receptors of the urinary bladder wall are totally removed?

In micturition:

Correct the statement given below by choosing the right option shown in the bracket against it:
The faeces in the rectum initiate a reflex causing an urge for its removal (neural/hormonal).

Indicate whether the following statement is true or false:
Micturition is carried out by a reflex.

The outline of the principal events of urination is given below in an unordered manner:
$I.$ Stretch receptors on the wall of the urinary bladder send signals to the $CNS$.
$II.$ The bladder fills with urine and becomes distended.
$III.$ Micturition.
$IV.$ $CNS$ passes on motor messages to initiate the contraction of the smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter.
The correct order of steps for urination is: