The middle portion of the small intestine is the _____

Under which of these conditions might a pacemaker rhythm be irregular?

A. The patient's heart does not generate any inherent impulses. B. The patient's heart generates impulses at a rate that is slower than the pacemaker rate. C. The patient's heart generates impulses at a rate that is faster than the pacemaker rate. D. The patient's underlying heart rhythm is irregular.

Match the terms with their definitions.

A. Administering a substance that will stimulate the immune response B. Protein molecules produced by B lymphocytes in response to an antigen C. Substances that is capable of producing an immune response; may be live or inactivated