Fill in chart for Isometric and Isotonic contractions trial In this activity, bo

Question

Fill in chart for Isometric and Isotonic contractions trial

In this activity, both isometric and isotonic contractions will be demonstrated. You may need a partner or family member to help you with this exercise. 1. Before beginning, set up a data table similar to the Data Table 6 in the Lab Report Assistant section to record observations while performing the experiment. 2. Retrieve the A&P; textbook or other heavy textbook. 3. Obtain the ruler with metric measurements. 4. Stand up and extend your arm straight out in front of you so that it is parallel to the floor. DO NOT BEND YOUR ELBOW AT ALL. 5. Palpate (feel) your biceps brachii muscle. Feel the tension of the muscle and measure the length using the ruler. Record this information into Data Table 6, "Trial 1" 6. Hold your hand out and load your arm with the textbook. Palpate the biceps brachii again and notice the degree of muscle tension. Measure the length of the muscle. Record your observations under "Trial 2" in Data Table 6. 7. Gently squeeze the biceps brachii muscle with your opposite hand. Repeatedly flex your arm holding the book six times. Move the textbook at least six inches each time. Palpate the muscle while doing the repetitions, and hold the book at the top of the repetition to measure length again with the ruler. Record your muscle tension and length observations under "Trial 3" in Data Table 6. 8. Fill in the "Type of Contraction" for each trial in Data Table 6.

Explanation / Answer

In isometric muscular contraction, the length of the muscle does not change. In isotonic contraction, the length of the muscle changes. It is of two types: concentric and eccentric. Concentric contractions cause muscles to shorten and eccentric contractions cause muscles to elongate. Using this information, the table can be filled as below.

Trial 1 Trial 2 Trial 3 Tension increased same same Length 16 cm 18 cm 14 cm Type of contraction isometric isotonic eccentric isotonic concentric

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