A tissue has the following characteristics: free surface, single layer of cells, cells are narrow and tall, microvilli, many mitochondria, goblet cells. Which of the following is most consistent with those observations?
(1) active transport
(2) epithelium
(3) simple epithelium
(4) columnar epithelium
(5) cuboidal epithelium
(6) squamous epithelium
(7) secretion by exocytosis
(8) movement of mucous across its surface
A. 2, 3, 4, 7
B. 1, 2, 3, 5, 7
C. 1, 2, 3, 4, 8
D. 2, 3, 4, 8
E. 1, 2, 3, 4, 7
E
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Which of the following is responsible for the falling phase of an action potential?
a. opening of Na+ gates b. Na+-K+ pump restoring the ions to their original locations c. greatly increased permeability to Na+ d. Na+ efflux e. none of these
On a median section of a sheep brain, the hypothalamus lies ________ to the thalamus.
A. anterior B. lateral C. superior D. posterior E. inferior
A parent of an baby visits her pediatrician because her baby is turning orange. Fortunately, the baby's lab tests indicate no abnormality. What could be causing the orange coloration?
A. The mother has been feeding the baby orange soda. B. The baby's diet consists of mostly sweet potatoes and carrots. C. There is no logical explanation for this coloration change. D. The baby was in the sun too long.
Materials that are to be discharged from a cell via exocytosis are packaged by which organelle?
A. Mitochondrion B. Ribosome C. Endoplasmic reticulum D. Lysosome E. Golgi complex