Final answer:
Retinene (retinaldehyde) is derived from Vitamin A. Vitamin A functions in the human body in four different forms, including retinal, which is the aldehydic form. Retinal is a hydrocarbon molecule related to vitamin A that is found in opsin pigments in the eye.
Step-by-step explanation:
Retinene (retinaldehyde) is derived from Vitamin A. Vitamin A functions in the human body in four different forms, including retinal, which is the aldehydic form. Retinal is a hydrocarbon molecule related to vitamin A that is found in opsin pigments in the eye. When a photon hits retinal, it undergoes a biochemical alteration where some of the double-bonded carbons switch from a cis to a trans conformation.