Which of the following percussors used for chest physiotherapy have adjustable frequency controls?

A(n) is a form, requested by a patient and signed by a physician, refusing

CPR if the heart stops. A. health care proxy C. do not resuscitate order B. power of attorney D. ethics statement for the living

Acanthocytes or spur cells have membranes with irregular distribution of spikes. What other significant feature does this cell possess?

a. Increased size b. Presence of Pappenheimer bodies c. Decreased life span d. Lack of central pallor