Which of the following is a method of administering an injection that targets immediate absorption?

Intravenous injection is a method that allows for immediate absorption of the administered substance directly into the bloodstream. This method ensures that the medication reaches its target site rapidly, making it particularly effective for situations where speed is critical, such as in emergencies.

The intravenous route is commonly used for medications that need to act quickly or when precise dosing is necessary, as it bypasses the need for absorption through tissues or the gastrointestinal system. This immediacy is vital in medical settings, where prompt treatment can be crucial for patient outcomes.

Other methods, while useful for specific purposes, do not provide the same level of immediacy. For example, subcutaneous injections require the drug to be absorbed through the skin and into the bloodstream, which takes longer compared to intravenous methods. Intranasal injections can provide rapid absorption as well, but not to the same extent as intravenous injections, which deliver substances directly into circulation. Intra-arterial injections, while also directing substances into the bloodstream, are more complex procedures generally used for specific treatments and are not as commonly used as intravenous injections for immediate absorption.