Myosin: Definition, Function & Structure

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Pinocytosis: Definition & Examples

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
Your next lesson will play in 10 seconds
  • 0:00 Where Is Myosin Found?
  • 0:35 What Is Myosin?
  • 1:43 Structure of Myosin
  • 2:26 Lesson Summary
Save Save Save

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Speed Speed

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Ryan Hultzman
There are many different fibers and filaments that help cells and organisms move, walk, talk, breathe, etc. One of these filaments is called myosin. Watch the video lesson to find out what myosin is, how it works and its structure.

Where Is Myosin Found?

In both eukaryotic cells, cells that have membrane-bound organelles and a nucleus, and prokaryotic cells, cells that lack a nucleus and membrane-bound organelles, we can find myosin. It exists as a filament inside of the cell. It is responsible for a number of interactions, such as movement and contractions of muscles. Again, myosin can be found in most every kind of cell; it is not specific to a certain kingdom, like plants or animals, or type of cell.

What Is Myosin?

Myosin is a motor molecule that works to move the cell. This will result in a contraction and expansion movement. It works closely with a globular protein called actin that polymerizes to create actin filaments. Myosin is a special protein that converts adenosine triphosphate (ATP), a molecule that cells use in order to live and work, into mechanical energy (energy for work). This will then generate force and movement.

To unlock this lesson you must be a Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use

Become a member and start learning now.
Become a Member  Back
What teachers are saying about
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account