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25 Cards in this Set
- Front
- Back
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Fish have which type of skeleton? |
Endoskeleton |
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During skeletal muscle contraction, myosin heads attach to binding sites associated with ... |
Thin filaments |
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Which bone cell type is responsible for bone resorption |
Osteoclasts |
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The most important minerals stored in bones are ... |
Calcium and phosphorus |
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What are the three connective tissue layers in muscle? |
Epimysium, perimysium, endomysium |
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What organelle wraps around the myofibril and stores calcium? |
Sarcoplasmic reticulum |
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In muscles the sarcomere extends between which structures? |
Z-lines |
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During muscle contraction what initiates the power stroke? |
Release of inorganic phophate |
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Skeleton size increases in a non-linear fashion to animal size |
True |
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In a myocyte/myofibril t-tubules are an extension of the ... |
Sarcolemma |
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The main component of bones organic matrix is ... |
Collagen |
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Exothermic organisms are most likely to have a hydrostatic skeleton |
True |
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The gap between the axon terminal an of a motor neuron and the sarcolemma of a skeletal muscle cell is called the ... |
Synaptic cleft |
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Chitin is a common component of which skeleton type? |
Exoskeleton |
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An exoskeleton is acellular |
True |
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Muscle contraction cannot take place without calcium because of which structure blocking the myosin binding site? |
Tropomyosin |
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The heads of the myosin myofilaments are called ... when they link the thick filament to the thin |
Cross bridges |
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Actin is the main component of the thick filament |
False, myosin is |
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What chemical element is required for the cross bridge cycle? |
Calcium |
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A shell is an example of what type of skeleton |
Exoskeleton |
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The majority of bone consists of an organic matrix |
False, it consists of calcium phosphate crystals |
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Apodemes serve as an attachment site for muscles to the exoskeleton. What is the equivalent in endoskeletons? |
Tendons |
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Cross bridges are created when myosin heads bind to ... |
Thin filaments |
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The epimysium is the connective tissue layer which surrounds individual muscle fibers |
False, the endomysium does |
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Hydroxylapatite is a mineral made of what? |
Calcium and phosphate |
