The lining of the nose consists of ________ membrane.
Fill in the blank(s) with the appropriate word(s).
mucous
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________ are unstable molecules that are formed during normal metabolism and are thought to contribute to aging, disease, and some cancers.
Fill in the blank(s) with the appropriate word(s).
DNA polymerase is most active during which phase of the cell cycle?
A. G0 B. M C. G2 D. G1 E. S
What occurs during the time between the first heart sound and the second heart sound?
A. ventricular systole B. ventricular diastole C. ventricular filling D. atrial systole E. the P wave of the ECG
Neural signals about oxygen levels in the blood come from
A. osmoreceptors in the hypothalamus. B. oxygen receptors in the primary respiratory center. C. chemoreceptors in the carotid and aortic bodies. D. baroreceptors in the aorta and carotid arteries. E. hemoglobin detectors in the pons.