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The protein responsible for helping break down clots after they are no longer needed is __________.

A woman with Rh- blood does not have anti-Rh antibodies in her blood unless ______.

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

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

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 ______.