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Cards In This Set
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What is the Sarcolemma?
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The cell membrane.
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What is the Sarcoplasmic Reticulum?
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Tubular network that stores and transports calcium ions.
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What are Transverse Tubules?
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Tubular system that allows electrical impulses to enter muscle fibers.
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What is Myoglobin?
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Gives muscles color and stores needed oxygen, it has a greater affinity for oxygen then hemoglobin and disassociates oxygen faster than hemoglobin.
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What are myofibrils?
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The contractile apparatus of muscle fibers, has bundles of filaments called myofilaments and is seen as light and dark bands.
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What are I Bands?
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Light areas
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What are A bands?
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Dark areas
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What are H Bands?
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Area in the middle of each dark band
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What are M bands?
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Thin line down center of each H band
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What are Z discs?
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Thin line down center of each I band
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What are Sarcomeres?
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Smalest functional unit extending from 1 Z disc to the next Z disc
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What are contractile proteins?
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Main protein element consists of actin from i bands and myosin from a bands.
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What are regulatory proteins?
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Act as inhibitory force associated with actin filaments that prevent myosin heads from interacting with actin.
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What are Troponin and Tropomyosin?
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2 most common regulatory proteins that recognize calcium as signal to allow actin and myosin to interact with each other.
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What is the role of Calcium in muscles?
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Eliminates inhibition of regulatory proteins allowing muscle contractions to occur, calcium ions are released from sarcoplasmic reticulum and bind with troponin on the actin.
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