The primary function of platelets is to: a. Defend the body ...

[stephzh]

The primary function of platelets is to:
 
  a. Defend the body against bacterial invasion.
  b. Carry oxygen to tissues.
  c. Facilitate blood clotting.
  d. Regulate acid-base balance.

Question 2

Which laboratory specimens must be treated with standard (universal) precautions?
 
  a. Only those labeled with a biohazard sticker
  b. Only those from patients known to have human immunodeficiency virus (HIV) or hepatitis
  c. All human blood and body fluids
  d. All specimens submitted for bacterial culture

[jazzlynnnnn]

Answer to Question 1

ANS: C
Whenever disruption occurs to a blood vessel so that bleeding results, platelets respond initially to stop the bleeding in small vessels; they also play an integral role in facilitating the formation of a blood clot. White cells defend against bacterial invasion; red cells (i.e., hemoglobin) carry oxygen to tissues; and a complex interaction of plasma electrolytes, proteins, and carbon dioxide participates in acid-base balance.

Answer to Question 2

ANS: C
All human specimens, whether they are blood, urine, any body fluid, or a specimen submitted for culture, should be treated identically using universal standard precautions. Even a patient who professes to feel well can harbor an infectious agent that has the potential for transmission.