The physician orders Ancef 0.5 grams IV for a urinary tract infection.

After reconstituting, the medication is available as 330 milligrams per milliliter.

How many milliliters will the nurse administer? Round to the tenths.

Choice A rationale

Testosterone is the primary male sex hormone, an androgen, responsible for the development of male secondary sex characteristics and reproductive tissues. While present in trace amounts in females, it has no direct role in the pulmonary physiology or the production of pulmonary surfactant, which is the critical deficiency leading to respiratory distress syndrome (RDS) in preterm neonates.

Choice B rationale

Somatotropin, also known as growth hormone (GH), is a peptide hormone responsible for stimulating growth, cell reproduction, and regeneration. Its main effects are on somatic growth and metabolism. Although many hormones influence fetal lung maturation indirectly, an altered secretion of somatotropin is not the primary physiological cause for the development of neonatal respiratory distress syndrome.

Choice C rationale

Surfactant is a lipoprotein complex produced by Type II alveolar cells. Its function is to lower the surface tension within the alveoli, preventing their collapse upon expiration. In preterm infants, especially those born before 34 weeks' gestation, the production of adequate amounts of surfactant is often immature or insufficient, leading to widespread atelectasis and the clinical picture of respiratory distress syndrome.

Choice D rationale

Progesterone is a major female sex hormone primarily involved in the menstrual cycle, pregnancy, and embryogenesis. It plays a crucial role in maintaining pregnancy by supporting the uterine lining. While steroid hormones are generally involved in fetal development, altered secretion of progesterone is not the main physiological factor causing the acute alveolar collapse seen in respiratory distress syndrome.

Choice A rationale

Astigmatism is an irregular curvature of the cornea or lens, which causes light rays to focus unevenly on the retina, resulting in distorted or blurred vision at any distance. The primary treatment for astigmatism is the use of corrective lenses, such as eyeglasses or contact lenses, not therapeutic eye patching.

Choice B rationale

Hyperopia, or farsightedness, occurs when the light focuses behind the retina because the eyeball is too short or the cornea is too flat, causing difficulty seeing objects up close. This condition is primarily managed by prescribing convex corrective lenses to help shift the focal point onto the retina.

Choice C rationale

Myopia, or nearsightedness, occurs when the light focuses in front of the retina because the eyeball is too long or the cornea is too steep, causing blurry distance vision. The standard treatment involves concave corrective lenses to diverge light rays and properly position the focal point on the retina.

Choice D rationale

Amblyopia, commonly called "lazy eye," is a reduction in visual acuity in one eye that results from the eye and brain not working well together, often caused by untreated strabismus or refractive errors. Patching the strong eye forces the brain to use the weaker, amblyopic eye, stimulating the development of the neural pathways necessary for clear vision.