The nervous system is responsible for stimulating digestion and causing the bladder to contract

Parasympathetic nervous system.

Explanation:

Parasympathetic nervous system is one of the division of the autonomic nervous system, that regulates the proper functioning of the body.

Parasympathetic nervous system controls the process of digestion, conserves energy and slows the heart rate of the organisms. This nervous system causes relaxation of the sphincter muscles of the digestive tract. The bladder contraction is also caused the stimulation of the parasympathetic nerves.

Thus, the answer is parasympathetic nervous system.

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