Skeletal Muscle Fiber Anatomy - Test 4
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| What layer of connective tissue connects the two ends of the skeletal muscle fiber? | The endomysium layer.
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| A tendon attaches muscle to bone, what is the tendon made of? | Collagen and Elastin fibers that merge with the endomysium
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| Is a muscle fiber uninucleated? | No, it is multinucleated.
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| True or False, the skeletal muscle cell body is one of the largest cell bodies? | True
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| What is a myofibril? | series of sarcomeres running the length of the fiber.
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| How many T-Tubules are there per a sarcomere? | 2
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| What mineral does the sarcoplasmic reticulum? | Ca++
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| What is the thick fibers of the sarcomere called? | Myosin = Thick, Actin = Thin
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| Tropomysin complex is consists of Troponin and which type of fiber? | Actin
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| Tropomyosin is a THIN long fiber that covers and spans how many monomers? | 7 actin monomers
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| How many globular proteins? | 3 Globular Proteins - C, T, I as in aCTIn.
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| Which of the 3 globular proteins binds to actin? | I
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| Which of the 3 globular proteins binds to tropomyosin? | T
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| Which of the 3 globular proteins binds to calcium? | C
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| How many subunits is myosin composed of? | 6 protein subunits - 2 long thin units twisted together and 4 light chains
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| What type of fibers span the I band? | Only Actin
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| What protein structure supports the actin fibers? | The Z-Disc
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| True or False, the A Band changes length during muscle contraction? | False, the A Band does NOT change length
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| What are T-Tubules? | Invaginations of the sorcolemma
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| How does the action potential effect levels of Calcium in the sarcoplasm? | It increases it 1000X
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| How many Ca++ ions bind to Tropin C? | 4
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| During muscle contraction the myosin head and ADP - P binds to what? | The Actin binding site
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| When the ADP and P group are released from the myosin head it causes the myosin head to flex from ____ degrees to _____ degrees? | 90 degrees to 45 degrees which in turns moves the actin fiber across the myosin.
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| How far does the actin move across the myosin in each flexion of the myosin head? | 10nm
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| What happens when ATP binds to the myosin head? | The myosin head releases the actin
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| What enzyme splits ATP into ADP - P causing the myosin head to return to its original 90 degree orientation? | MyosinATPase
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| What is the normal level of Ca++ ion concentrations in the sarcoplasm? | 0.00000007 molar
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| How many Ca++ ions is transported into the sarcoplasmic reticulum for every ATP burned? | 2 this is accomplished by Sarcoplasmic reticular Ca++ ATPase
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