During Defecation

Multiple Choice

During defecation,

A) stretch receptors in the rectal wall activate sympathetic centers in the spinal cord.
B) stretch receptors in the rectal wall activate parasympathetic centers in the spinal cord.
C) stretch receptors in the rectal wall activate both sympathetic and parasympathetic centers in the spinal cord.
D) the internal anal sphincter is consciously relaxed.
E) the external anal sphincter contracts.