An instructor is reviewing the physiology of the female reproductive system with a group of students. In discussing the uterine anatomy, the instructor emphasizes the role of the myometrium. Which statement accurately reflects a function of the uterine myometrium?

A. Ileocecal sphincter:the ileocecal valve/sphincter regulates flow from ileum to cecum in the GI tract, unrelated to urinary control.
B. Internal urethral sphincter: Incorrect (mostly involuntary) -the internal sphincter (smooth muscle) provides involuntary control of urine retention at the bladder neck via autonomic regulation.
C. Internal anal sphincter: the internal anal sphincter controls fecal continence (involuntary), not urinary flow.
D. External urethral sphincter: the external urethral sphincter is skeletal muscle under voluntary control and allows conscious initiation or delay of urination.

A. Gallbladder: The gallbladder stores and releases bile into the duodenum via the common bile duct when stimulated (e.g., by CCK). It does release a secretion into the duodenum, but it primarily stores bile produced by the liver.
B. Liver: The liver produces bile, which drains via hepatic ducts into the common bile duct and empties into the duodenum -the liver is a primary secretor whose products reach the duodenum.
C. Spleen: The spleen is a lymphoid/hematologic organ (filters blood, immune functions) and does not release digestive secretions into the duodenum.
D. Gastric glands: Gastric glands secrete gastric juice into the stomach lumen (not the duodenum), so they do not release secretions into the duodenum.
E. Pancreas: The exocrine pancreas secretes digestive enzymes and bicarbonate into the duodenum via the pancreatic duct.
F. Intestinal glands: Intestinal glands (crypts of Lieberkühn) secrete intestinal juice directly into the intestinal lumen (including the duodenum), but the most commonly tested paired organs that "release secretions into the duodenum" are the liver (bile) and pancreas (pancreatic juice).