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The pacemaker cells of the heart are located in the:

What is the order of the five major steps used for obtaining and identifying a pure bacterial culture?

After B-cells become plasma cells they:

Once a T cell is activated, it forms a clone of T cells. Will these T cells have the same T- cell receptor?

List all the signals that a DC and a T cell need to have to activate the T cell. Write what signals of the DC match signals of the T cell.

The nurse cares for a client with an ejection fraction of 25%.  Which would the nurse expect to observe? 

Polychlorinated biphenyls (PCBs) are a group of manmade chemicals. They are oily liquids or solids, clear to yellow in color, with no smell or taste. PCBs are very stable mixtures that are resistant to extreme temperature and pressure and are used widely in electrical equipment like capacitors and transformers and in coolant fluids. PCBs are highly toxic industrial compounds. They pose serious health risks to fetuses, babies and children, who may suffer developmental and neurological problems from prolonged or repeated exposure to small amounts of PCBs. These chemicals are harmful to adults as well. Small amounts of PCBs are found in meat, dairy products and drinking water. Fish are the major dietary sources of PCBs , especially fish caught in contaminated lakes or rivers. Level of PCBs found in fish will vary with region and the type of fish native to that region. This chart shows the PCB concentrations found at the various trophic levels in the Saginaw Bay ecosystem of Lake Huron. Notice that the fish in the higher trophic levels accumulate more PCBs than those in lower trophic levels. (credit: Patricia Van Hoof, NOAA) Other examples of environmental contaminants are:  DDT (pesticide) accumulating in birds of prey (raptors), Mercury levels being too high in mackerel, etc. What ecological concept does this demonstrate? Refer to the figure below if needed:    

The nurse cares for a client with a history of a large anterior-lateral wall MI 3 days ago. The client reports chest pain that is worse with inspiration, and improves with sitting forward. The nurse auscultates a scratching/grating sound with each heart beat, that continues to be heard with the client holding their breath. Which does the nurse anticipate that the client is experiencing?

In the figure below, the growth curve labeled “c” represents a(n)

Which cardiac symptom is MOST likely to be reported by women or diabetics presenting with acute coronary syndrome (ACS)?