The first secondary curvature of the spine to develop in an infant is in the
A. cervical region.
B. thoracic region.
C. lumbar region.
D. sacral region.
E. coccygeal region.
Answer: A
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Which of the following statements about the endocrine system is NOT true?
A. Some neurons secrete hormones. B. Both the nervous and endocrine systems respond quickly and are active for a long time. C. The hypothalamus is important to both the nervous and endocrine systems. D. Both the nervous and endocrine systems may utilize the same chemical molecule.
The period of time when Na+ channels are recovering from their inactive state and K+ channels are still open is the ________.
A. repolarization B. relative refractory period C. absolute refractory period D. Both repolarization and relative refractory period are correct.
Oxygen that is entirely devoid of moisture:
A) is less combustible than humidified oxygen. B) will dry the patient's mucous membranes quickly. C) is optimum for patients requiring long-term oxygen. D) should be given in conjunction with bronchodilators.
Tubular load refers to the amount of a given substance that
A. can be actively reabsorbed from the filtrate. B. is present in the blood as it enters the afferent arteriole of the nephron. C. can be secreted into the filtrate. D. passes through the filtration membrane into the nephron each minute. E. None of the choices are correct.