{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

MCB 32L Lab Report #3

MCB 32L Lab Report #3 - Jae Shin Wendy Ingram Lab Report#3...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Jae Shin 09/28/10 Wendy Ingram Lab Report #3 Lab 3: Muscle Excitability and Contractility I. Introduction Background: All of our actions depend on skeletal muscles and we may control them voluntarily or involuntarily. For this lab, we will use an electrical stimulator to simulate the effect of motor neurons on muscles in our hands and record the motion of our pinky finger. To increase the strength of contraction, you can either increase the recruitment of motor units and/or stimulate motor units more frequently. This lab will also explore the phenomenon of tetanus, where two muscle contractions are timed close enough so that their effect (or part of their effect) are combined, resulting in a stronger twitch response. And if the timing is right, these contractions will “fuse” into an explosive force far greater than just a single twitch. Hypothesis: My hypothesis is that if the stimulus voltage is increased, then the force or the twitch tension and the time of contraction will increase as well. II. Materials and Methods In order to stimulate the skeletal muscle, a Grass S44 Stimulator with Stimulus Isolation Unit will be used. A red and black stimulating electrodes attached to the unit will be placed on two specific location of the hand, and the subject hand will be placed on top of a book for elevation. The tip of the pinky finger with slight
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
tension will be placed against toe Strain Gauge, which will be securely taped to the table. Excel Labscribe program will be used to electronically record and illustrate the experimental data. For each part of the experiment, Recruitment,
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern