MCQ
Petromyzon belongs to
- ✓Agnatha
- BGnathostomata
- CProtochordata
- DEuchordata
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Identify $A \;to \;D$ and choose the correct option
$I.$ Stretch receptors on the wall of urinary bladder send signal to the $CNS$
$II.$ The bladder fills with urine and becomes distended
$III.$ Micturition
$IV.$ $CNS$ passes on motor messenger to initiate the contraction smooth muscles of bladder and simultaneous relaxation of urethral sphincter
The correct order of steps for urination is