Which of the following types of dispersions is either water in oil or oil in water?
An ointment
A lotion
A gel
An emulsion
An emulsion
Rationale: An emulsion is a dispersion that may be water in oil, or oil in water. An ointment is a homogeneous, viscous, semi-solid preparation. A lotion is a liquid for topical application that contains insoluble solids or liquids. A gel is a two-phase system containing extremely fine solid particles that, when mixed, is difficult to distinguish between its two phases – it is considered a semisolid form.
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What type of injection reduces the risk of adverse reactions and side effects to other parts of the body but increases the risk of toxicity if the wrong dose is administered?
A) Intra-articular B) Intracardiac C) Intra-arterial D) Intraperitoneal
When the nervous system signals a muscle to contract, the ________ ion channels open
A) phosphorus B) actin C) sodium D) myosin