In response to severe injuries or burns, the body may repair itself by producing scar tissue to fill the damaged area. This process is called ________.
Fill in the blank(s) with the appropriate word(s).
fibrosis
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Cranial nerves are part of the CNS.
Answer the following statement true (T) or false (F)
Which of the following statements regarding NK cells is a false or incorrect statement?
A) NK cells are a type of neutrophil. B) NK cells are present in the blood, spleen, lymph nodes, and red bone marrow. C) NK cells attack cells that display abnormal MHC antigens. D) NK cells attack cancer cells and virus-infected body cells.
The descending limb of the nephron loop ________
A) is not permeable to water B) is freely permeable to sodium and urea C) contains fluid that becomes more concentrated as it moves down into the medulla D) pulls water by osmosis into the lumen of the tubule
Neurons and other excitable cells respond to stimuli by producing ________
A) electrical signals B) pressure gradients C) and secreting chemical messengers