Antacids such as Zantac, help to prevent hearturn, by blocking histamine receptors. This results in a reduction of the production and excretion of stomach acid. Which of the following cells would be most affected by this drug?     A.  chief cells         B.   parietal cells   C. mucous neck cells      D. surface epithelial cells

A patient came to a dental clinic with complaints of dry mouth and multiple dental caries lesions. In the course of collecting anamnesis, it was found that an allergic patient takes antihistamines that block the H2 histamine receptors of smooth muscle cells of the salivary glands. It is known that histamine is a mediator that stimulates the secretion of saliva. Explain the mechanism of action of these drugs if it is known that the next day after discontinuation of the drug, the patient's dryness disappeared. For this: а) write the classification of inhibitors according to the mechanism of action b) indicate what type of inhibitors the drugs are taken by the patient; confirm your conclusion in writing c) guess what structure this drug may have d) give a picture illustrating the action of this type of inhibitors.

North Americans have among the highest rates of colon cancer in the world. Rates of type 2 diabetes and cardiovascular disease are also among the highest in the world. Give two reasons why these rates are so high, and explain how they could be reduced.

During the chemotaxis phase of the inflammatory response,a. C-reactive protein is secreted by damaged parenchymal cells in the tissue, which attracts neutrophils, which secrete leukotrienes and prostaglandins to attract macrophages; a purulent exudate is formed.b. Band cells respond to hyperthermia by producing TNF-α and interleukins, which then cause a left shift that results in the accumulation of neutrophils within the tissue.c. Damaged parenchymal cells release prostaglandins and leukotrienes to attract macrophages, causing a left shift and the formation of a purulent exudate.d. Cytokines, such as TNF-α, are released by damaged parenchymal cells, while leukotrienes and prostaglandins produced by neutrophils cause smooth muscle constriction and the further accumulation of leukocytes.