Health-care workers are exposed to many different types of
pathogenic and nonpathogenic microorganisms. Which body systems
work together to protect the body from pathogens?

a Digestive and excretory
b Muscular and vascular
c O Circulatory and immune
d Endocrine and reproductive

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

Which enzymes break down carbohydrates?

What substance acts to prevent sudden ph changes in bodily fluids?