The oxygen saturation of a healthy individual rarely reaches 100% on room air. This can best be explained by which of the following concepts?
a. Physiologic shunting c. Collateral air passages
b. Alveolar capillary diffusion d. Anatomic dead space
A
The mixing of venous blood from the bronchial circulation with the oxygenated blood in the left atrium decreases the saturation of left atrial blood to a range between 96% and 99%. For this reason, while a person is breathing room air, the oxygen saturation of arterial blood is less than 100%.
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A gravida patient at 32 weeks of gestation reports that she has severe lower back pain. The nurse's assessment should include
a. Observation of posture and body mechanics b. Palpation of the lumbar spine c. Exercise pattern and duration d. Ability to sleep for at least 6 hours uninterrupted
The nurse is aware that a copper intrauterine device (IUD) can be used as an emergency contraceptive measure if it is inserted within a maximum of ____ days after unprotected sex
a. 7 b. 8 c. 9 d. 10
The endocrine secretions of the pancreas regulate the metabolism of ___________
Fill in the blank(s) with the appropriate word(s).
The adverse effects of phenothiazine antipsychotics arise due to the:
A. stimulation of cholinergic and histamine receptors. B. blocking of gamma-aminobutyric acid receptors. C. blocking of cholinergic and histamine receptors. D. stimulation of D2 and histamine receptors.