Lab 9 - Name: _ Section: _DL3_ Lab Report: Exercise 9:...

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Name: ___ Section: _____DL3 _________ Lab Report: Exercise 9: Muscle Physiology Purpose: This lab is geared towards investigating several different kinds of muscle contractions which are designed to help us better understand muscle physiology. Muscles are deemed as excitable because they produce electrical impulses called action potentials. When muscles are at rest the electrical charge outside the cell is different from that outside of the cell. This electrical difference is referred to as the resting membrane potential. When a neuron stimulates a muscle, the nerve action potential causes the neuron to release chemical messengers called neurotransmitters, which carry the action potential over to the muscle cells causing a contraction. When sodium ion channels open in the sarcolemma and sodium ions rush into the fiber causing the muscle cell membrane to become depolarized. When the sarcolemma reaches a certain level potassium exits the fiber and it becomes repolarized, which is back to its resting membrane potential. Activity 1: Muscle Twitch 1
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Data Table 1B: Muscle Twitch of Data Table 1A: Muscle Twitch of Eye Muscle Quadricepes Femoris Time (milliseconds) Tension (kilogram-force) 0 0 1 0 2 0 3 10 4 20 5 30 6 40 7 30 8 20 9 10 10 5 11 2 12 0 Data Table 1C: Muscle Twitch of Plantaris Time (milliseconds) Tension (kilogram-force) 0 0 5 5 10 15 15 20 20 25 Time (milliseconds) Tension (kilogram-force) 0 0 3 10 6 20 9 30 12 35 15 40 18 35 21 30 24 25 27 22 30 15 33 12 36 5 39 0 2
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25 30 30 32 35 36 40 40 45 38 50 35 55 32 60 25 65 22 70 18 75 15 80 12 85 10 90 5 95 3 100 0 Questions A. What is a muscle twitch? A twitch is a single contraction/relaxation cycle.  Each twitch has three parts: latent period, contraction phase and relaxation  phase. B.
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This note was uploaded on 02/21/2011 for the course BIOLOGY 130 taught by Professor Megan during the Spring '10 term at Ocean County College.

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Lab 9 - Name: _ Section: _DL3_ Lab Report: Exercise 9:...

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