Your visual receptors have begun to detect, convert, and transmit the contours of the letters on this exam to your brain. you are therefor engaged in the process of

Your visual receptors have begun to detect, convert, and transmit the contours of the letters on this exam to your brain. You are therefore engaged in the process of sensation. 

Lysosomes contain digestive enzymes (lysozyme) and in digestion of different biomolecules like proteins, fats, starch, etc.cleans the cell by destroying damaged organellesprotects cells from certain virus/bacteria by killing them