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Bio 106 #2 2 wrong

QuestionAnswer
In excitation-contraction coupling, calcium ions must bind with myosin to expose active sites on actin
A myofilament is the cell membrane of a muscle fiber.
Acetylcholine binds to a membrane bound receptor and causes ligand-gated sodium channels to open and results in hyperpolarization.
Depolarization of the cell membrane occurs when there is a rapid influx (inflow) of potassium ions.
Which of the following is NOT a property of the myosin head? They form cross-bridges with the active sites of actin.
Arrange these structures as they participate in excitation-contraction. T tubules, sarcolemma, calcium ions, sarcoplasmic reticulum
The active sites to which cross-bridges attach are found on the sarcoplasmic reticulum.
Which of the following situations occurs in electrically excitable cells? When Na+ ion channels open, K+ ion channels close.
Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane? increased permeability of the membrane to sodium ions
Which of the following structures contains the other four items listed? postsynaptic membrane
T tubules are invaginations of the sarcoplasmic reticulum.
Troponin has two subunits.
Synaptic vesicles in the neuromuscular junction contain calcium.
Actin myofilaments resemble bundles of minute golf clubs.
Channels that open or close in response to changes in the electrical charge or voltage across the plasma membrane are called ligand-gated ion channels
Sarcoplasm is the cell membrane of a muscle fiber.
Muscles exhibit the property of excitability. This means that the muscle shortens its length
Which of the following is true about skeletal muscle? Sensory neurons stimulate muscles to contract.
Which of the following is mismatched? I band - contains only actin
Which of the following is true during the resting membrane potential? Sodium ion concentration is greater inside cells.
The region of the sarcomere that contains both actin and myosin myofilaments is called the I band.
Arrange the following list of biochemical events in the correct sequence.1 An action potential is conducted deep into the muscle fiber by the T tubule.(2) Calcium ions bind to troponin. (3) The membranes of the sarcoplasmic reticulum become more permeab 1, 5, 2, 3, 4
Which of the following is part of a thin myofilament? ATP-binding site
Which of the following causes an unequal ion concentration across the resting plasma membrane? the functioning of the sodium-chloride pump
Created by: alexs13
 

 



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