Which of the following statements regarding NK cells is false?
a. They express either inhibitory receptors or activating receptors, but not both.
b. Their inhibitory receptors are necessary to prevent killing of healthy cells.
c. They all express CD56.
d. Because NK cells express diverse combinations of receptors, no single NK cell expresses them all.
e. Some of their activating and inhibitory receptors use MHC class I ligands.
A
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Glue ear, a thick accumulation of secretions, is associated with ________
A) cerumen impaction B) labyrinthitis C) otitis externa D) otitis media
Blockages of blood flow causing damage to the heart are known as: ________.
What will be an ideal response?
This is a planned physical activity with the purpose of improving fitness or lowering health risks.
A. energy B. life C. health D. exercise