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What acid is responsible for stomach acidity?

The atrioventricular valves are indicated by which numbers?    

In humans, most nutrient molecules are absorbed by the _____.  

What type of epithelium would you expect to find covering a surface subject to physical forces?

How is the stomach lining protected from the strongly acidic pH of its contents?

From the pulmonary veins, blood flows to the _____.

_____ muscle moves the bones.

Vertebrate immune cells, which are phagocytic, include ________.  I) neutrophils II) macrophages III) dendritic cells IV) natural killer cells

The matrix of blood tissue, where water, salts, and dissolved proteins are found, is _____.  

Hyperventilation (rapid inhalation and exhalation) can result in respiratory alkalosis (increased blood pH). Why?