Infant respiratory distress syndrome is caused by
a. surfactant-secreting cells that do not work yet.
b. underdeveloped alveoli.
c. clogged bronchioles.
d. underdeveloped bronchi.
e. small lungs.
A
You might also like to view...
Stramenopiles are unique in that they possess:
A. double plastids B. hairy flagella C. alveoli D. disk-shaped mitochondrial cristae E. calcium carbonate crystals
Which of the following statements is false?
a. Veins lack smooth muscle and elastic fibers. b. Parasympathetic nervous system stimulation decreases heart rate. c. Adjustments to blood flow result from stimuli from the nervous and endocrine systems and from changes in local chemicals. d. Thrombin is an enzyme that acts on fibrinogen. e. Hemostasis stops bleeding.
The semicircular canals are
a. empty. b. filled with gas. c. filled with a liquid. d. filled with bones or stones. e. filled with sand grains.
Prokaryotic operons typically include a(n) ________ and a(n) ________ with multiple genes
A) operator; terminator B) operator; promoter C) promoter; repressor D) inducer; repressor E) CAP-binding site; inducer