5 fl. oz = __________ mL (LABEL CORRECTLY)

Choice A rationale

The vastus lateralis muscle is the preferred intramuscular injection site for infants and children due to its large muscle mass and lack of major nerves or blood vessels, minimizing the risk of injury. This site is easily accessible and provides a safe area for medication absorption in developing musculature.

Choice B rationale

The ventrogluteal site is generally considered safe and effective for intramuscular injections, but it requires precise anatomical landmark identification, which can be challenging in infants and young children, increasing the risk of sciatic nerve injury if landmarks are not accurately identified.

Choice C rationale

The dorsogluteal site is contraindicated for intramuscular injections in infants and children due to the risk of sciatic nerve damage. The sciatic nerve runs through this area, and the muscle mass is not fully developed in younger patients, making it a hazardous site.

Choice D rationale

The deltoid muscle is too small and underdeveloped in infants and young children to safely accommodate intramuscular injections. Its limited muscle mass increases the risk of injury to underlying nerves and blood vessels, and absorption capacity is reduced.

Choice A rationale

Lymphadenopathy refers to enlarged lymph nodes, which are palpable structures of the immune system. Bruits are vascular sounds, specifically turbulent blood flow, and are entirely unrelated to the presence or size of lymph nodes. Lymphadenopathy indicates an immune response or lymphatic system issue, whereas bruits indicate arterial pathology.

Choice B rationale

Hypermetabolic states, such as hyperthyroidism, can increase cardiac output and blood flow velocity, potentially leading to flow murmurs in the heart. However, they do not directly cause bruits in the carotid arteries. Carotid bruits are typically indicative of localized arterial narrowing or disease, not a systemic increase in metabolism.

Choice C rationale

Bruits are audible vascular sounds, often described as a "whooshing" or "swishing" sound, that result from turbulent blood flow through a narrowed or partially occluded artery. In the carotid arteries, a bruit strongly suggests atherosclerotic plaque formation, which reduces the arterial lumen and disrupts the smooth, laminar flow of blood, creating turbulence.

Choice D rationale

Bruits are arterial sounds, reflecting turbulence within arteries. Venous disease primarily involves veins, and while some venous conditions like arteriovenous fistulas can produce continuous murmurs, typical bruits heard over carotid arteries are characteristic of arterial narrowing and compromise, not venous pathology. Venous hums can occur but are distinctly different from arterial bruits.