Briefly explain the role of vitamin A in maintaining normal vision
Vitamin A is a group of unsaturated nutritional organic compounds, that includes retinol, retinal, retinoic acid, and several provitamin Acarotenoids, among which beta-carotene is the most important.Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin the light-absorbing molecule necessary for both low-light (scotopicvision) and color vision. Vitamin A also functions in a very different role as retinoic acid (an irreversibly oxidized form of retinol), which is an important hormone-like growth factor for epithelial and other cells
In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to retinol (chemically an alcohol) in the small intestine. The retinol form functions
_________ _______ ________ _______ _____.
_____ ____ _______ ____ __________ _________ ____ ____ ____ ________.
_____ ____ _________ _______ ___ ____.
____ _____ ____ _______ _____ _____ ________ ________ _________ ______ ____.
______ _____ ___ ____ ___ ________ ____ ________ _____.
__________ ___ _______ __________ __________ _________ ______ ________ ___ _____.
_______ ________ __________ ________ _____ _____ ________ __________ _______ ______.
_________ _________ ______ ________ _________.
____ ________ ___ ____ ___ _____ ___.
_________ ________ ______ ___ _______ ______ _____.
___ ___ ______ _______ ________ _______ __________ __________.
_______ _____ _________ _______ ________.
________ ____ ________ __________ _______ ____ ________ ___.
__________ ___ ___ ________ ______ _________ ________ ______ __________ ____.
_____ ________ ___ __________ ____.
_____ ________ _________ ___ _____ _______ _________ __________.
______ _____ ___ ___ ________.
__________ ______ ________ __________ ____ ____ ___.
______ _________ _________ ____ _____ ____ _________ _________ ______ _______ ______.
_________ ______ ____ __________ _________ _____.
___ __________ ___ _______ ___ ______ ______ ________.
__________ ___ __________ ______ ______ _____.
_________ ___ _____ __________ ______ ______ ______ ______.
____ __________ ________ ___ ____ __________ ________ _____ ______ _________.
_____ ____ _____ ____ _________.
_____ _________ _______ ________ __________ _______ __________ _______.
___ __________ _____ ______ ______ _____ ______ ___ ______ __________.
__________ _______ ___ _________ ____ ________ _________ _______ ________ ____.
___ _________ ______ ______ _______ __________ ______ ___ ______ ________.
_________ ___ _____ ____ ______ ______.
_____ __________ _____ ___ ______ ____ __________.
_________ _________ _____ _________ ___ __________ ______ __________ _______.
____ ________ __________ _______ _________ _____.
____ ______ ________ __________ ________ ___ __________ ___ ____.
___ ____ ______ ___ _____ ______.
______ ______ ___ _________ _______.
_____ _________ ____ ___ ________.
_________ _____ ______ _________ __________.
__________ _______ ___ ____ _______ ______ _________.
_____ ____ ______ ______ ____ ______ ____ _______.
_________ ____ _________ ____ ___ ____ __________ ______.
__________ ___ __________ ____ _________ ______ ____ _______ _______ ____ _________ _____.
_______ __________ _________ __________ _____ _________ ___ _______.
________ __________ ____ ____ _______ ________ ____ ___ ____ _________ ____.
______ ____ _____ ________ ___ ______ __________.
__________ ________ _______ __________ _________ ________.
_________ __________ __________ ____ ______ _____ ____ ________.
____ ____ _____ ______.
- Solved Assignments
- Study Notes
- Guess Papers
- Question Papers
✓ Unlock up to 60% of the answer
✓ No payment required