A cell is isolated, and electrophysiology studies reveal that the resting membrane potential is ?70
millivolts. The predominant intracellular ion is Na+, and the predominant extracellular ion is K+.
With voltage change, which of the following would result in an action potential?
Correct Answer:
b. Na+ rushing into the cell
· Question 2
When a patient asks what causes cystic fibrosis, how should the nurse respond? Cystic fibrosis is
caused by an _____ gene.
Answer
Correct Answer:
d. Autosomal recessive
· Question 3
What is the diagnosis of a 13-year-old female who has a karyotype that reveals an absent
homologous X chromosome with only a single X chromosome present? Her features include a
short stature, widely spaced nipples, reduced carrying angle at the elbow, and sparse body hair.
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