Exam 2

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lonelygirl
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265137
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Exam 2
Updated:
2014-03-05 04:42:32
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Biology 103A
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  1. The function of the T tubules is to:

    A) bind the myofilaments together to form the sacromere
    B) remove Ca++ from the cytoplasm
    C) energize the myosin ATPase
    D) permit the AP (action potential) to reach the terminal cirstence
    E) bind the Ach neurotransmitter
    D) permit the AP (action potential) to reach the terminal cirstence
    (this multiple choice question has been scrambled)
  2. The activation gate (voltage sensitive gate) for Na+ is stilumated to open when _________ and closes when ___________.
    A) threshold voltage is reached/ the equilibrium potential is reached
    B) threshold voltage is reached/ membrane potential is below threshold
    C) Ach binds/K+ starts to leave
    D) Ach binds/ Ach unbinds
    E) threshold voltage is reached/ the inactivation gate closes
    B) threshold voltage is reached/ membrane potential is below threshold
    (this multiple choice question has been scrambled)
  3. Voltage gated Ca++ ion channels are found:

    A) in the terminal cisternae
    B) in the T tubule
    C) at the neuromuscular junction (NMJ)
    D) a and c
    E) all over the plasma membrane in cardiac muscle fibers
    D) a and c
    (this multiple choice question has been scrambled)
  4. The slowest gate to open during depolarization phase an action potential is:

    A) Na+ activation (voltage) gate
    B) Na+ inactivation gate
    C) K+ voltage gate
    D) none, all open at the same time
    C) K+ voltage gate
    (this multiple choice question has been scrambled)
  5. In a relaxed sacromere which of the following is NOT true?

    A) the myosin head is in its high energy state and erect position
    B) the myosin head is able to bind a new ATP
    C) the actin binding site for myosin is covered
    D) myosin is not bound to actin
    E) troponin lacks Ca++
    B) the myosin head is able to bind a new ATP
    (this multiple choice question has been scrambled)
  6. Recruitment causes:

    A) an increase of the frequency of action potential in a motor unit
    B) a longer duration to the contraction for each fiber
    C) a and c
    D) more motor neurons that innervate that muscle to be excited
    E) a greater percentage of the fibers in the muscle to contract
    C) a and c
    (this multiple choice question has been scrambled)
  7. Which subtype of skeletal muscle fiber would be recruited first and would fatigue last?

    A) slow oxidative
    B) fast oxidative
    C) fast glycolytic
    A) slow oxidative
    (this multiple choice question has been scrambled)

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