The basic functional units of the liver are the
A) hepatocytes.
B) stellate macrophages.
C) lobules.
D) portal areas.
E) bile canaliculi.
C
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Melanocytes can transfer granules of melanin into nearby epithelial cells.
Answer the following statement true (T) or false (F)
Active hyperemia refers to
a. arteriolar dilation in response to local chemical changes that accompany increased metabolic activity of the tissue b. local arteriolar mechanisms that are aimed at keeping tissue blood flow fairly constant in spite of wide deviations in mean arterial driving pressure c. the increase in blood flow to a tissue that occurs after removal of an occlusion of its blood supply d. maintaining adequate mean arterial pressure to drive blood forward into a tissue e. none of the above
Sweat gland secretion occurs in response to stimulation by the _______ division of the nervous system
Fill in the blank with correct word.
Considering the mechanisms of innate immunity, which of the following pairs is accurately matched?
A. Complement - slow the spread of viral infections B. Neutrophils - increase in number in response to bacterial infections C. Interferons - assist antibodies in the destruction of pathogens D. Eosinophil - recognize abnormal cells, such as cancer cells