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Muscle Physiology - Simulation - No Questions


Click and hold on the answer space to see the possible answers. Then select the correct answer and release. Answer all questions and then hit the "Score Test" button at the bottom.

Just watch the movie -- no questions here...

Here are the key terms that corresponds with each number.

 

1. Whole muscle

2. Fasciculi

3. Neuro-muscular junction

4. Sarcoplasmic reticulum

5. Calcium

6. Sarcomeres

7. Actin with T & T

8. Power stroke

 

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Events involved in the contraction of a muscle fiber


The focus here will be on one sarcomere - but the same events take place in every sarcomere within a muscle cell.


1. Calcium diffuses into the cell from the sarcoplasmic reticulum (SR) and transverse tubules. This is a diffusion event and is very quick.
2. Calcium binds with the troponin and tropomyosin system and changes its shape - opening up myosin cross bridge binding sites on the actin molecules.
3. Myosin crossbridges attach to actin and undergo a power stroke. This event requires ATP. Power strokes will continue until the calcium is moved from the T and T system.
4. During contraction, Z -lines move closer together, H-zones get smaller, but the protein filaments do not get shorter, but rather "slide" over each other. This is the sliding filament theory of muscle contraction.

 

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