Vaccinations a. are used to treat existing disease symptoms. b. prevent the spread of communicable diseases. c. are only given after the disease has been cured. d. prevent the spread of noncommunicable diseases.

How does the endocrine system affect the body's functions? o o o o it secretes enzymes directly into the bloodstream. it secretes hormones directly into the bloodstream. it secretes enzymes through ducts to the surface of organs. it secretes hormones through ducts to the surface of organs.

Wjat are substances intentionally added to food to produce a desired effect?

Khurshid is recovering from a heart attack. which type of rehabilitative care would she benefit from the most?