1) Exercise it by singing and hitting different notes, however don't go overboard
2) Make sure you don't overuse your voice, as well as trying to rest your voice when you are sick
3) Overall, have healthy habits, like not smoking and drinking a sufficient amount of water.
First, I see no italics. Second, your sentence looks like it has no errors.
Examples of Diagnostic Services workers;
Brian uses ultrasound technology to create images of a patient’s liver and kidneys.
Nigel performs tests on a patient to get information about how his heart is working.
Krystal analyzes X-rays to determine whether a patient has a broken arm.
Your body systems work together to keep you alive. Each of these systems is made up of organs
with specific functions. The structure of these organs and the cells of which they are made make
them well suited to their function. An important function of your body systems is to supply your cells
with energy and nutrients, and to remove wastes that are produced, thats the best I
have.
