The surfactant found in the fluid lining the alveoli is
A. brought into the alveoli in the inspired air.
B. synthesized by cells in the liver.
C. synthesized by alveolar cells.
D. synthesized by endothelial cells.
E. made only by fetal cells.
Answer: C. synthesized by alveolar cells.
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Which best defines "superficial"?
A. On the inside ?B. On the outside ?C. Toward the end of an appendage ?D. Close to the attachment of the appendage to the trunk ?E. At the head end
The spinal cord has
A) a core of gray matter surrounded by white matter. B) a cervical and lumbar enlargement. C) 31 segments. D) all of the above.
Bimodal breathers have the ability to use positive or negative pressures for ventilation
Indicate whether the statement is true or false
As skin cells move toward the surface of the body, they produce a protein that reduces water loss. This process is called ________.
A. germination B. pollination C. melaninization D. desquamation E. keratinization