Which of the following factors stimulates a newborn's first breath?
A) All of the above
B) Increasing concentration of carbon dioxide
C) Decreasing pH
D) Low oxygen concentration
A
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Blood flow through the kidney includes a feature seen in only a few organs. What is it?
A) arterial shunts B) portal system C) veins containing highly oxygenated blood D) vascular sinuses E) anastomoses
Cells that are found in small depressions on the endosteal surfaces are the
A) osteoblasts. B) osteocytes. C) osteoid. D) osteogenic cells. E) osteoclasts.
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.
One of the functions of the respiratory system is to alter the levels of carbon dioxide in the blood; thus regulating
A. blood glucose levels. B. oxygen levels. C. blood pressure. D. blood volume. E. blood pH.