How many liters of blood does the average adult have in the vascular system?

A clinical laboratory technician is asked to determine the concentration of red blood cells (RBCs) from a sample of turbid knee fluid using a hemacytometer. The technician dilutes the sample with normal saline and loads it onto the hemacytometer. A total

A) The WBC count B) The dilution factor C) The number of platelets D) The red-cell distribution width

The semilunar valves close when which of the following occurs?

a. The pressures in the arteries exceed those in the ventricles. b. The pressures in the ventricles and arteries become equal. c. The pressures in the atria exceed those in the ventricles. d. The pressures in the ventricles exceed those in the atria.