EXPERIMENT 15MUSCLE FUNCTION ANALYSIS

DEM

Activation of muscles by nerves results in the flow of ions across cell membranes

The flow of ions generates electrical activity that results in muscle contraction

An electromyogram (EMG) records the electrical activity within muscles

Muscles are attached to at least two points

Origin – attachment to a moveable bone

Insertion – attachment to an immovable bone

Figure 6.12

Figure 1

In Experiment 15 the extensors of the forearm will be studied

OBJECTIVES

In this experiment, you will Obtain graphical representation of the

electrical activity of a muscle. Associate muscle activity with

movement of joints. Correlate muscle activity with injury. 

MATERIALS

computer electrode tabs Vernier computer interface ruler Logger Pro (version 3.6) 5 lb weight (barbell) Vernier EKG Sensor

PROCEDURE

1. Connect electrodes2. Obtain baseline3. Collect and record data while flexing

and relaxing the extensor muscle of the forearm

4. Do # 3 with a weight (barbell)5. Change to the flexor muscles and do

the same thing.

IMPORTANT

Take notes on what you and your group are doing.

One person in the group is the subject (“guinea pig”).Each person will write a lab report (later)

sokeep track of what is going on.

WHAT TO HAND IN

1. Data table2. Data analysis (answers to the

questions)3. Lab Report (more instructions later on

this)