Matching For each scenario below.choose the muscle characteristic that is being described Each characteristic will be used several times. a. excitability c. extensibility b. contractility d. elasticity 5. A body builder lifts a barbell over his head. His tricep muscles shorten and become firm as he lifts the barbell. 6. After doing a leg extension, the dancer's muscles return to their original size. 7. When receiving STIM therapy (electric stimulation)muscles begin to twitch. 8. A runner stretches before her cross country meet to avoid tearing of her muscles during the race. When he is finished lifting weights, a weight lifter's muscles do not stay in the contracted state, but go back to their original size and shape. 10. A runner's brain sends a message to his hamstrings to contract.His hamstrings respond. 11. A dancer does a full leg extension without tearing her muscles.

## Step 1<br />The problem involves matching the given scenarios with the correct muscle characteristic. The muscle characteristics are excitability, contractility, extensibility, and elasticity.<br /><br />## Step 2<br />The first scenario involves a body builder lifting a barbell over his head. His tricep muscles shorten and become firm as he lifts the barbell. This is an example of contractility, which is the ability of a muscle to shorten and generate force.<br /><br />## Step 3<br />The second scenario involves a dancer's muscles returning to their original size after doing a leg extension. This is an example of elasticity, which is the ability of a muscle to return to its original shape after being stretched or contracted.<br /><br />## Step 4<br />The third scenario involves muscles beginning to twitch when receiving STIM therapy (electric stimulation). This is an example of excitability, which is the ability of a muscle to respond to stimuli.<br /><br />## Step 5<br />The fourth scenario involves a runner stretching before her cross country meet to avoid tearing of her muscles during the race. This is an example of extensibility, which is the ability of a muscle to be stretched without being damaged.<br /><br />## Step 6<br />The fifth scenario involves a weight lifter's muscles not staying in the contracted state, but going back to their original size and shape after lifting weights. This is another example of elasticity.<br /><br />## Step 7<br />The sixth scenario involves a runner's brain sending a message to his hamstrings to contract, and the hamstrings responding. This is another example of excitability.<br /><br />## Step 8<br />The seventh scenario involves a dancer doing a full leg extension without tearing her muscles. This is another example of extensibility.