What two cell types are mainly responsible for graft rejection?
A. B cells and helper T cells
B. natural killer cells and B cells
C. marcrophages and natural killer cells
D. cytotoxic T cells and helper T cells
E. B cells and plasma cells
D
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Describe the functions of the facial bones
A) The facial bones protect the anterior portion of the brain. B) The facial bones protect the posterior portion of the brain and provide a site of attachment for neck muscles. C) The facial bones protect and support the entrances to the digestive and respiratory tracts and provide a site of attachment for muscles of facial expression. D) The facial bones provide a site of attachment for the muscles that move the eyes, jaw, and head. E) The facial bones form the lower jaw and provide a site of attachment for muscles that allow speaking and chewing.
Which is found inside the membranous labyrinth?
A. Blood B. Perilymph C. Air D. Endolymph
The P wave of an ECG indicates
A. atrial depolarization. B. atrial repolarization. C. ventricular depolarization. D. ventricular repolarization. E. threshold.
When blood oxygen is ________, erythropoietin is released, which ________ production of erythrocytes.
A. high; inhibits B. low; stimulates C. low; inhibits D. high; stimulates