A deficiency in what type of vitamin presents itself through symptoms of night blindness?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the Nutrition Section 1 Test. Master nutrition topics through diverse questions, complete with hints and explanations. Get confident for your test!

Multiple Choice

A deficiency in what type of vitamin presents itself through symptoms of night blindness?

Explanation:
Night vision in low light depends on a pigment in the retina called rhodopsin, which requires vitamin A to form. When vitamin A is deficient, rhodopsin can’t be regenerated efficiently, so adaptation to darkness is impaired and night blindness occurs. Beta-carotene, on the other hand, is a precursor that the body converts into vitamin A; it helps maintain vitamin A status but is not the vitamin itself. So night blindness points to a deficiency of the actual vitamin A, not a lack of beta-carotene.

Night vision in low light depends on a pigment in the retina called rhodopsin, which requires vitamin A to form. When vitamin A is deficient, rhodopsin can’t be regenerated efficiently, so adaptation to darkness is impaired and night blindness occurs. Beta-carotene, on the other hand, is a precursor that the body converts into vitamin A; it helps maintain vitamin A status but is not the vitamin itself. So night blindness points to a deficiency of the actual vitamin A, not a lack of beta-carotene.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy