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A sample of John’s blood shows a high level of pyrogens. This would indicate that John

The ________ divides the aorta into the thoracic aorta and the abdominal aorta.  

Cardiac output is increased by  

In a(n) ________, either the immune system fails to develop normally or the immune response is does not function to protect the person.  

The atrioventricular valves permit blood flow  

Immunity that results from antibodies that pass through the placenta from mother to fetus is called ________ immunity.  

The brachial artery branches to form the radial and ________ arteries.  

Leslie has a severe sore throat and the lymph nodes in her neck are swollen. This would indicate that  

Which of the following layers of a vessel contains collagen fibers with scattered bands of elastic fibers?  

Stress can affect the immune response in all of the following ways EXCEPT by