What is the role of cilia in the respiratory tract?
A) Cilia in the upper respiratory tract direct mucus to the pharynx so that it can be swallowed. Stomach acids subsequently destroy any respiratory irritants trapped in the mucus.
B) Cilia trap respiratory irritants such as dust and other small particles.
C) Cilia produce mucus.
D) Cilia are present on the surface of cells that line the trachea, but they have no defined function in the respiratory system.
A
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Eicosanoids are modified from ____
a. arachidonic acid b. cytokines c. growth factors d. histamine e. glucose
Cortical nephrons can only produce a dilute urine while juxtamedullary nephrons can produce either dilute or concentrated urine depending upon hormonal conditions.
a. true b. false
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