The ________ in a POL is generally used to separate whole blood samples into blood components or to prepare urine samples for examination by spinning the specimens at high speed. 

Your 15-year-old male patient has a stab wound along the right sternal border at the fourth intercostal space. The patient responds to painful stimuli and shows little evidence of external bleeding. His respirations are 30, his breath sounds are clear and equal, and his radial pulse is weak and disappears on inspiration. The patient has distended jugular veins and is dyspneic. This patient is most likely suffering from ________ shock due to ________.

A) obstructive; cardiac tamponade B) hypovolemic; hemothorax C) distributive; loss of sympathetic nervous tone D) hypoxic; tension pneumothorax

The therapist is mechanically ventilating a patient who has lung parenchymal injury characterized by regional compliance inhomogeneities. What potential problem should the therapist bear in mind as an appropriate tidal volume is delivered to this patient's lungs?

A. that a leak around the cuff of the ETT is likely to occur B. that the likelihood of air trapping exists C. that overdistention of normal lung regions is likely to occur D. that higher pressures will be needed to inflate the less compliant regions