Which is true of a neuron with a resting potential?
The cell membrane is permeable to Na+ but impermeable to K+ ions.
The outer surface of the plasma membrane has a negative charge.
The highest concentration of K is extracellular.
The sodium pump has moved Na to the outside of the plasma membrane.
The Correct Answer is D
A. The cell membrane is permeable to Na+ but impermeable to K+ ions: This is the opposite of reality; the resting membrane is much more permeable to K+.
B. The outer surface of the plasma membrane has a negative charge: At rest, the outside of the membrane is positively charged relative to the inside.
C. The highest concentration of K is extracellular: K+ is primarily an intracellular ion, while Na+ is primarily extracellular.
D. The sodium pump has moved Na to the outside of the plasma membrane: The Na+/K+ pump actively maintains the resting potential by pumping sodium out of the cell.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. prostate gland: The prostate secretes a slightly acidic, milky fluid that helps with sperm motility but does not provide the primary sugar source.
B. bulbourethral gland: Also known as Cowper glands, these secrete an alkaline mucus to neutralize urine acidity in the urethra.
C. seminal vesicle: These glands contribute about 60% of semen volume, including fructose to provide ATP energy for sperm "swimming."
D. Cowper gland: These secrete an alkaline mucus to neutralize urine acidity in the urethra.
Correct Answer is B
Explanation
A. central canal: This is the space in the center of the spinal cord through which CSF flows, but it is not the primary site of formation.
B. choroid plexuses: These are networks of capillaries found in the ventricles of the brain specifically designed to filter blood and produce CSF.
C. subarachnoid space: This is the area where CSF circulates around the brain and spinal cord.
D. arachnoid villi: These are responsible for the reabsorption of CSF back into the blood, not its formation.
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