Only _____ can be absorbed by the small intestines.

The _____ of intestinal crypts secrete antimicrobial agents such as defensins and lysozyme.

The acinar cells of the pancreas secrete _____.

The _____ layer of the alimentary canal lines the lumen and secretes mucus, digestive enzymes, and hormones while also having the capability to absorb the end products of digestion.

The unique _____ layer of the muscularis externa allows the stomach to churn and mix the food (mechanical breakdown).

In ventilation-perfusion coupling, _____ is defined as the amount of blood flow reaching alveoli.

Which of the choices below explains why the small arterioles are known as resistance vessels?

_____ capillaries are the most permeable and have macrophages which inhabit the lining and engulf bacteria that might try to cross the capillary wall.

The coronary arteries _____.

Atrioventricular valves are anchored to papillary muscles by _____, which holds valves in a closed position during ventricular systole.