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19 Cards in this Set
- Front
- Back
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Name the layers of the epidermis from the surface down:
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1) stratum corneum - anucleate
2) stratum lucidum 3) stratum granulosum 4) stratum spinosum - desmosomes 5) stratum basalis |
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Tight junction is also called zona ___.
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zona occludens - prevents paracellular movement of stuff
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E-cadherin + actin filaments =
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zona adherens (intermediate junction) - located just below tight junction
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Desmoplakin + keratin =
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macula adherens (desmosome!)
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What are gap junctions for?
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allows adjacent cells to communicate rapidly (for electric and metabolic functions)
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A young man comes in screaming because he injured his knee. His lower leg is grotesquely abducted at the knee. He has torn the:
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medial collateral ligament
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Positive "anterior drawer" sign =
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torn ACL
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Which 4 muscles make up the rotator cuff? (SItS)
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1) supraspinatus - helps deltoid abduct arm
2) infraspinatus - lateral rotation 3) teres minor - adduct & laterally rotate 4) subscapularis - adduct & medially rotate |
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This molecule is needed to release actin from myosin to allow cross-bridge cycling and muscle shortening.
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ATP - binds to myosin head
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What does calcium bind to in order to create a conformation change so that actin & myosin can cycle?
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troponin C
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A sarcomere is measured from __ to ___.
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Z line to Z line
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The A band refers to:
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myosin filament length (remains constant)
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The H band refers to:
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gap of space between actin filaments in a sarcomere, spans midsection of myosin filaments
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The I band refers to:
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gap of space between myosin filaments, includes only actin filaments (and one Z line)
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Which segments of a sarcomere shrink during muscle contraction?
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HIZ contract
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Which kind of calcium channel is located in the T tubule membrane of a muscle fiber?
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dihydropyridine receptor (voltage-sensing Ca channel protein)
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Which kind of calcium channel is located in the sarcoplasmic reticulum of a muscle cell?
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ryanodine receptor
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Myosin light chain kinase phosphorylates myosin, leading to smooth muscle contraction/relaxation.
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contraction
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Myosin light chain phosphorylase take off a phosphate from myosin, leading to smooth muscle contraction/relaxation.
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relaxation
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