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26 Cards in this Set
- Front
- Back
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When ACh bonds with its receptor:
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Na+ diffuses into a muscle fiber
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Which of these occur first on a sarcolemma?
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ACh binds with a chemically-gated channel
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What ion causes vesicles filled with ACh to bind with the cell membrane of an axon terminal?
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Ca++
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Which of these best describe how curare (arrow poison) works at the molecular level?
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Curare competes with ACh for binding spots on ACh receptors
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When Na+ enters a cell thru channel proteins, it causes _______ of the sarcolemma.
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depolarization
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Which of these are true?
At the neuromuscular junction: |
A neuron forms a synapse with a muscle cell
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Which of these describes the function of ACh ?
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neurotransmitter
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Na+ and K+ could be described as:
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Ions
Electrolytes (is a fluid that contains ions, so not really a good answer) Elements All of the above |
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What kind of molecule is acetylcholinesterase?
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a protein
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Resting transmembrane potential of a skeletal muscle cell is:
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-70mV
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actin is
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thin
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myosin
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thick
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Which of these is made out of the same kind of tissue as a tendon?
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epimysium
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A sarcolemma is made up of
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mostly phospholipids (cell membrane)
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Which of these is smallest in diameter?
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myofilament
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In any particular muscle cell, which of these would be found in the greatest number?
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Actin molecules
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In any particular muscle, which relationship below is true?
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Number of muscle fibers = number of muscle cells
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Which of these is made up of cells with an extracellular matrix that contains fibers?
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perimysium
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Which of these is largest in diameter?
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muscle fiber
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Which of these is true?
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A myofibril is made up of many sarcomeres laid end to end
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Which of these are all made of connective tissue?
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Endomysium, perimysium, epimysium
Tendon, aponeurosis, perisosteum |
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What’s a difference between a muscle fiber and a connective tissue fiber?
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A muscle fiber is larger than a connective tissue fiber
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Sarcomeres are:
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Collections of Myofilaments
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depolarization
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of the synaptic sarcolemma =motor end plate is a brief response that normally lasts only a couple milliseconds
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repolarization
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returns the sarcolemma to its resting rate
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muscle fascicle
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bundle of muscle fibers; separated from one another by the fibers of perimysium
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