Physioex actividad 2

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 includeyour 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 of45 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|
|about 1 second. | |
|less than 1 msec. | |
|between 2-3msec. | |
|variable, depending on the voltage that was applied to it. | |
|True or False: Another name for a muscle cell is “myofibril.”|FALSE |
|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 MUSCLE FIBER– SKELETAL MUSCLE CELLS COMPOSED OF MANY |
|and latent period. |CELLS THAT PRODUCE MUSCLE TENSION. THESE FIBERS ARE WHAT MOVE |
| |OUR BODIES. |
||MOTOR UNIT – ONE MOTOR NEURON AND ALL SKELETAL MUSCLE FIBERS |
| |THAT IT STIMULATES. LOCATED AT NEUROMUSCULAR JUNCTION ( AKA |
||MOTOR PLATE) WHERE AXON AND TERMINAL OF NEURON MEET. |
| |SKELETAL MUSCLE TWITCH – ELECTRICAL PULSES TRIGGER ACTION |
| |POTENTIALS. TWITCH ISRESULT OF MECHANICAL RESPONSE TO SINGLE |
| |ACTION POTENTIAL. (EXCITATION-CONTRACTION) |
| |ELECTRICAL STIMULUS – ISOLATED STIMULUS THAT SENDS ENERGY |
|...