Answer to Question 1
ANS: C
The O'Beirne sphincter controls the movement of wastes from the sigmoid colon into the rectum. None of the other options performs this function.
Answer to Question 2
ANS: A
The ileogastric reflex, not the gastroduodenal, inhibits gastric motility when the ileum becomes distended. The gastroileal reflex, which is activated by an increase in gastric motility and secre-tion, stimulates an increase in ileal motility and relaxation of the ileocecal valve (sphincter). The gastrocolic reflex initiates propulsion in the entire colon, usually during or immediately after eat-ing, when chyme enters from the ileum.
Movement of myosin-coated beads along actin filaments.
The relationship between free energy and electron movement along the electron transport chain
Movement of sound waves through the human ear.
Coordination of antagonist muscles to perform movement.
A sigmoid (cooperative) binding curve
water movement