22. An activated Helper T cell releases ______________ that stimulates proliferation and differentiation of white blood cells.

25. Cigarette tar can selectively damage the _____________ found in the respiratory passages.

7. The platelet plug is triggered by

18. Which of the following does NOT have valves?

9. Which of the following is NOT an example of an autoimmune disease?

12. What enzyme on the surface of your skin can destroy some viruses?

4. When determining if someone can receive a blood transfusion you must compare

10. Vitamin K deficiency leads to decreased levels of

Strengthening exercises are contraindicated in all of the following EXCEPT:

You are measuring knee flexion with a goniometer on a patient taking muscle relaxers and experiencing occasional spasms. What is the most appropriate course of action?