Vitamin a plays an essential role in the human body in

1. preventing scurvy.
2. acting as an antioxidant and scavenging free radicals.
3. protecting polyunsaturated fatty acids (pufas) from oxidation.
4. maintaining healthy vision.

(4) Maintaining healthy vision

Explanation:

Vitamin A plays an essential role in maintaining good vision

answer: b. complete secondary assessment (detailed physical exam).

after you finished the primary assessment, you must proceed with the assessment by performing a complete detailed physical examination.

this secondary assessment includes a focused on patient’s history, vital signs and a specific and rapid examination of the entire body especially on the injuries acquired from the motor vehicle accident and the patient’s medical complaint.