Which statement most closely describes how the polio vaccine works? a) it allows the blood to filter out the disease-causing agent. b) it prevents the disease-causing agent from entering the body. c) it attacks the disease-causing agent as soon as it enters the body. d) it triggers the immune system to produce antibodies to fight the disease-causing agent.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.