What affects the absorption rate of injections?

What affects the absorption rate of injections?

• A. The ambient temperature.
• B. The blood supply in the area it's injected.
• C. The color of the patient's eyes.
• D. The patient's hair length.

Answer: (B)

Absorption rate is driven by how well the injection site is supplied with blood. If the area has rich blood flow, the drug is carried into the bloodstream faster, leading to quicker absorption and onset of action. This is why injections into well-perfused tissue, like muscle, rise into circulation more quickly than injections into fatty tissue with less blood flow. The other factors listed don’t meaningfully affect how quickly the drug enters circulation—eye color and hair length have no role, and ambient temperature has only a minor, indirect effect through possible changes in blood flow rather than being a primary determinant.

Absorption rate is driven by how well the injection site is supplied with blood. If the area has rich blood flow, the drug is carried into the bloodstream faster, leading to quicker absorption and onset of action. This is why injections into well-perfused tissue, like muscle, rise into circulation more quickly than injections into fatty tissue with less blood flow. The other factors listed don’t meaningfully affect how quickly the drug enters circulation—eye color and hair length have no role, and ambient temperature has only a minor, indirect effect through possible changes in blood flow rather than being a primary determinant.