Final answer:
A bolus is a single, concentrated dose of a drug usually injected into a blood vessel over a short period of time. It allows for rapid absorption and immediate effects.
Step-by-step explanation:
Bolus
is a single, concentrated dose of a drug usually injected into a blood vessel over a short period of time. It is a quick and effective way to deliver a drug directly into the bloodstream, allowing for rapid absorption and immediate effects. For example, insulin injections are often administered as a bolus to increase blood glucose levels before consuming a meal. Other routes of drug administration include capsules, suppositories, and infusions, but they are not typically administered as a single concentrated dose.