Compare and contrast isometric and isotonic muscle contractions. Describe muscle tone.

2B. Define a twitch. Discuss the phases of a twitch when graphed. List the events that occur at each.

3. Compare the structure and function of skeletal, cardiac, and smooth muscles. Include similarities and differences.   Mention  summation, gradation, speed of contraction, fatigue, sarcomeres,

Explain the elation between muscles,ATP energy, and the calcium ion.

7. Discuss isotonic and isometric  contractions.

1. Draw and label the steps of the sliding filament mechanism in skeletal muscle. This should be four parts (Cross- bridge, power stroke, disassociation, reactivation). On each part, be sure to include the following structures: actin, myosin, troponin, tropomyosin. Also include ATP, myosin ATPase, ADP, Pi, and H* (where important). • Cross-bridge: . Powerstroke: ● Disassociation: ● Reactivation:

2. Diagram, label and explain the components of a muscle fiber

1 pts List the following events in order as they would occur inside a skeletal muscle fiber: 1) cross-bridge 2) action potential (AP) arrives at the motor end plate 3) AP travels down the t-tubule 4) calcium pumped into sarcoplasmic reticulum 5) opening of voltage-gated calcium channels O 2, 5, 4, 3, 1 O 5, 1, 2, 4, 3

9. Explain the process that occurs to generate a muscle contraction. Name the four major stages and be able to describe the events that happen at each stage.

III. Conclusion about Muscle Performance. why it is important?