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.

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

The coronary arteries _____.

_____ are lymphoid cells that can capture antigens and then deliver them to the lymphocytes in lymph nodes.

Which of the following is a function of the lymph nodes?

Which of these granulocytes contain histamine, a pro-inflammatory chemical, in its granules?