PracticeQuiz content is free on an ad-supported model.

Unfortunately, we can't support ad blocker usage because of the impact on our servers. If you'd like to continue, please disable your ad blocker and reload page.

Reload page

DAT Review Questions (Dental Admissions)

Category - Biology

Start a Study Session Sign up for Question of the Day

What is the function of the myelin sheath that surrounds neurons?

Increase speed of impulses
Maintain polarization
Decrease friction
Control growth of neurons
Oxygen exchange

Explanation

Answer: A, Increase speed of impulses. The myelin sheath serves exclusively to increase the speed at which impulses travel across neurons.

Key Takeaway: The myelin sheath increases electrical resistance across a cell membrane by a factor of 5, 000 and decreases capacitance by a factor of 50. Combined, these two factors prevent the electrical current from escaping the axon, thus improving the speed at which impulses travel.

Previous Next

Was this helpful? Upvote!

Start a Study Session Sign up for Question of the Day

DAT Review Questions (Dental Admissions)

Top questions

Related questions

Most popular on PracticeQuiz

Ad-Blocker not supported

DAT Review Questions (Dental Admissions)

Top questions

Related questions

Most popular on PracticeQuiz