Stem cells that will form T cells develop in the
A) bone marrow.
B) liver.
C) spleen.
D) thymus.
E) kidneys.
Answer: D
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The orbicularis oculi muscle
A. puckers the mouth for kissing. B. contributes to laughing and smiling. C. causes crow's feet wrinkles. D. raises the eyelid. E. contributes to pouting.
In the maintenance of the cell resting membrane potential ________.
A) extracellular sodium levels are high B) cells are more permeable to Na+ than K+ C) the steady state involves only passive processes in all cells D) the inside of the cell is positive relative to its outside
When a cell is in the repolarizing phase of an action potential, its intracellular environment is becoming more ______ when compared with the extracellular environment.
A. negative B. positive
The most prominent distinguishing characteristic of elastic cartilage is the presence of ________
A) numerous thick collagen fibers interspersed between alternating rows of lacunae in the matrix B) chondrocytes C) densely packed elastic fibers in the matrix. D) a glassy appearance