Intravenous administration requires the drug to be in an aqueous solution because the bloodstream is an aqueous environment and the medication must be readily dissolved to mix with blood and distribute quickly and predictably. An aqueous solution avoids particulate matter that could irritate or obstruct vessels, reducing the risk of embolism. It also allows proper control of dose, isotonicity, and sterility for safe IV use. Other forms pose problems: an oil suspension contains undissolved particles that may not distribute evenly and could cause embolic complications or require emulsification; a gas form could lead to air embolism; and a solid crystalline form would not dissolve, risking vessel blockage and unreliable dosing. Hence, an aqueous solution is the appropriate form for IV delivery.

Parasympathetic dominance increases gastric motility and secretions, speeding up the movement of stomach contents into the small intestine. The vagus nerve stimulates smooth muscle contractions (peristalsis) and relaxes the pyloric sphincter, promoting faster gastric emptying. In contrast, sympathetic dominance constricts blood vessels, dampens GI smooth muscle activity, and slows or inhibits gastric emptying. So, the quickest digestion occurs when the parasympathetic system is dominant, leading to increased gastric emptying.

A weak base tends to accumulate in acidic environments due to ion trapping. In the stomach, pH is very low, so the weak base is largely protonated to form the conjugate acid. This charged form cannot cross membranes easily, so once the drug enters the stomach lumen, it gets trapped there and its concentration rises relative to plasma. In plasma, pH is near neutral, where the base exists more in its uncharged, membrane∝permeable form, so it doesn’t get trapped as much. Therefore, more drug is expected in the stomach than in the plasma.

Absorption from the oral cavity can occur through the buccal or sublingual mucosa, allowing drugs to enter systemic circulation. This route is used for medicines designed for rapid effect or to bypass first-pass metabolism in the liver. Whether absorption happens depends on drug properties such as lipophilicity, molecular size, and the degree of ionization at saliva pH, as well as formulation and contact time with the mucosa. Because there is valid, real-world potential for absorption via the oral cavity for suitable drugs, the statement about absorption from this site being possible is true. The other options are less accurate because they suggest either no information, partial truth, or a false universal claim, whereas we know absorption can happen under the right conditions.