Why can’t a person with type A blood safely receive blood from a person with type B blood?

The vessels that return blood to the heart are called

White blood cells that are increased in individuals with allergic reactions are the

Which of the following is true for hematopoietic stem cell transplants?

In an undiluted spinal fluid, 87 RBCs and 32 WBCs were counted in 4 mm2 on a hemocytometer with a depth of 0.1mm. The CSF WBC count would be reported as:

Increased triglycerides may be noted in which of the following situations? 

Which of the following answers is correct concerning T lymphocytes?

An O-negative mother gave birth to an A-positive infant.  The mother had no history of antibodies or transfusion.  This was her first child.  The baby was mildly jaundiced and the DAT was weakly positive with polyspecific AHG.  What could be the cause of the positive DAT result?

The drug procainamide is prescribed to treat cardiac arrhythmia.  What biologically active liver metabolite of procainamide is often measured simultaneously?

Two parents with sickle cell trait have a child – What is the probability that the child inherits homozygous sickle cell disease?