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If the connection between the SA node and AV node becomes blocked,  

As a result of the long refractory period in the cardiac action potential, cardiac muscle CANNOT exhibit  

Infection with the HIV virus occurs through  

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

Blood pressure increases with all of the following EXCEPT increased  

The large vessels that return blood to the heart are called  

The coronary sulcus is a groove that  

 Stem cells that will form B cells or NK cells are found only in the  

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

T cells and B cells that destroy only one antigen without affecting other antigens or normal tissues, this is termed