The crown of a tooth is covered by
A) enamel.
B) cement.
C) dentin.
D) pulp.
E) periodontium.
A
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A T cell can only become activated after being physically or chemically stimulated by the abnormal target cell in a process called
A) costimulation. B) opsonization. C) sensitization. D) neutralization. E) precipitation.
Tetanic muscle contractions don't occur in a normal cardiac muscle because
A) cardiac muscle tissue contracts on its own. B) neural stimulation is lacking. C) the refractory period lasts until the muscle relaxes. D) the refractory period ends before the muscle reaches peak tension. E) potassium channels outnumber sodium channels.
The study of the relationships of the body's structures by examining cross sections of tissues or organs is called ________ anatomy
A) gross B) surface C) systemic D) regional E) sectional
How does the structure of a lymph node allow lymphocytes and macrophages to perform their protective function?
What will be an ideal response