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169 Biology Connective Tissues Contribute Coastal Carolina Community College

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Coastal Carolina Community College

169 Biology Connective Tissues Contribute Coastal Carolina Community College

RE-LAB QUESTIONS
ow do banding patterns change when a muscle contracts?When a muscle contracts,the myosin and actin myofilaments decrease in length, causing them to come together and the H zones shrink and narrow as a result. However, the A band remains the same. What is the difference between a muscle organ, a musclefiber, a myofibril, and a myofilament?A muscle organ is a tissue composed of cells and fibers and produces movement throughout the body causing contraction. A muscle fiber is a single muscle tissue cell and consists of more thanone nucleus. A myofibril is only found in striated muscle cells and made of actin and myosin. Lastly myofilaments make up myofibrils. Outline the molecular mechanism for skeletal muscle contraction. At what point is ATP used and why?Myosin heads must bind to a fresh molecule of ATP to disconnect.Once myosin releases actin the ATP is hydrolyzed, and another cycle of actin/myosin interaction is initiated. ATP is a short-term energy boost and releases large amounts of energy when turned into ADP. Explain why rigor mortis occurs.Rigor mortis occurs because the circulation in the body has stopped and muscles require phosphagen andATP. Muscles contract when myosin shifts, but since there is no ATP it isunable to detach anymore and that is why the muscles stay contracted.

EXPERIMENT 1: TENDONS AND LIGAMENTS
Post-Lab Questions
1.Identify the components in the slide image below basedon your observations from theexperiment.

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169 Biology Connective Tissues Contribute Coastal Carolina Community College

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