Exercise 2: Skeletal Muscle Physiology

Topics: Skeletal muscle, Myosin, Muscle Pages: 12 (2570 words) Published: April 7, 2012
EXERCISE 2: Skeletal Muscle Physiology

Student Name: Student ID#:

Student instructions: Follow the step-by-step instructions for this exercise found in your lab manual and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Rename this document to include your first and last name prior to submitting, e.g. Exercise2_JohnSmith.doc. Please make sure that your answers are typed in RED. (You may delete these instructions before submission.)

Grading: True/False, Multiple-Choice, and Fill-in-the-blank type questions will be worth 1 point each whereas Short-answer type questions will be worth 2 points each. This lab will be worth a total of 76 points but will be converted to a percentage grade when registered in your “Gradebook”.

|ACTIVITY 1: The Muscle Twitch and the Latent Period |Answers | |The latent period of the skeletal muscle that was tested in this lab simulation was |c. between 2-3 msec. | |about 1 second. | | |less than 1 msec. | | |between 2-3 msec. | | |variable, depending on the voltage that was applied to it. | | |True or False: Another name for a muscle cell is “myofibril.” |False: Another name for a muscle cell is “Myoblast” | |The largest active force that could be generated in the muscle is Activity 1 was _______ grams. |1.82 grams | |Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, |Skeletal muscles are composed of hundreds to thousands of | |and latent period. |individual cells called muscle fibers, which produce muscle | | |tension. Pg 15 PhysioEx 9.0 | | |Motor unit consists of a motor neuron and all of the muscle | | |fibers it innervates. Pg 16 PhysioEx 9.0 | | |Skeletal muscle twitch, the mechanical response to a single | | |action potential. A muscle twitch has three phases: the latent | | |period, the contraction phase and the relaxation phase Pg 16 | | |PhysioEx 9.0 | | |Electrical stimulus affects whole-muscle function. Pg 18 | | |PhysioEx 9.0...
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