The most important muscle in the bladder is the detrusor muscle. In normal circumstances, when the bladder fills with urine, it can stretch to hold the urine. When the volume in the bladder reaches close to 300 cc, the stretch in the wall of the bladder can trigger a nerve response to initiate urination (micturition).
by Sandi Ackerman. .A rabbit's diet should be made up of good quality pellets, fresh hay, (alfalfa, timothy or oat), water, and fresh vegetables. Anything beyond that is a treat and should be given in limited quantities. Pellets should be fresh, and should be relatively high in fiber (18% minimum fiber).
1 Remember that pellets should only be a supplement to other foods, and not form the foundation of your rabbit's diet. 2  Pick pellets that are timothy-based rather than alfalfa-based. 3  Alfalfa pellets tend to be higher in calories and can cause obesity. 4  Pellets come in two forms: muesli and extruded.