Which of the following is NOT an accessory organ to the digestive system?

The layers of the alimentary canal, from outside to inside, are the __________.

Materials moving between body cells and blood capillaries pass through the _________, which surrounds all tissue cells.

The mineral required for the normal conduction of nerve impulses as well as ATP–ADP conversions is ___________.

Which tonsils are located in the nasopharynx?

Deciduous teeth lack _______, whereas permanent teeth have all four types of teeth.

Acid chyme entering the duodenum causes the intestinal mucosa to secrete the hormone ________, which stimulates the secretion of ________ that is rich in bicarbonates.

The antibody that acts as a receptor on the surface of B cell is ______.

_________ that migrate into tissues become mast cells, which release _________ in allergic reactions.

________ are leukocytes that neutralize histamine and destroy parasitic worms.