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Once a helper T-lymphocyte recognizes an antigen, it begins the immune response by secreting chemical signals called

_____ in the _____ cavity provides lubrication and reduces friction as the lungs change size during ventilation.

Bile salts are

41. This kind of stress pushes on the structure of a building and must be countered by a pulling stress.  

The atrial reflex relies upon chemoreceptors to detect stretch in the atrial wall.

_______________ financed the growth of industry by selling shares or part ownership in companies to individuals.

The Fc region of some antibodies can trigger the activity of NK cells.

46. In the nineteenth century, this material became both less costly and more widely available for construction.  

The Spanish and Portuguese Empires had based their superiority over the indigenous Americans on their Catholic faith; in the second half of the nineteenth century, imperialists based their superiority on

The posterior interventricular sulcus