In a healthy person, low oxygen in the blood is a stronger stimulus for breathing than high carbon dioxide in the blood.
a. true
b. false
Ans: b. false
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Which of the following happens first after a scab forms?
A) fibroblasts from the wound edge form new collagenous fibers. B) blood vessels send out new branches under the scab. C) the scab sloughs off. D) phagocytic cells remove dead material.
Which of the following factors would increase the amount of oxygen released by hemoglobin from the bloodstream?
A) decreased temperature and decreased pH B) decreased pH and increased temperature C) increased tissue PO2 and increased pH. D) decreased tissue PO2 and increased pH E) decreased temperature and increased pH
Which of the following statements about DNA replication is TRUE?
The leading strand is replicated continuously, while the lagging strand is replicated discontinuously. The leading strand is replicated discontinuously, while the lagging strand is replicated continuously. Both the leading and lagging strands are replicated continuously. Both the leading and lagging strands are replicated discontinuously. Each of the leading and lagging strands is replicated both continuously and discontinuously.
Juxtaglomerular nephrons __________.
produce little urine produce concentrated urine account for 85 percent of all nephrons do not produce urine