Muscular force can be adjusted to match different loads by
a) recruiting larger motor units
b) varying the frequency of action potentials in motor neurons
c) recruiting more motor units
d) A, B, and C
e) None of the above muscle contraction is all-or-none.
Answer: D
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Muscle
- During the recovery period the body's need for oxygen is increased because
- Which of the following is not a type of motor unit?
- Each skeletal muscle fiber is controlled by a motor neuron at a single
- How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?
- Compared to a "typical" body cell, skeletal muscle cells are
- The region of the sarcomere that always contains thin filaments is the
- Creatine phosphate
- The type of contraction in which the muscle fibers do not shorten is called
- Fast fibers
- During anaerobic glycolysis
- During the recovery period following exercise, all of the following are true, except
- Calcium ions are binding to troponin during the ________ of a muscle twitch.
- Fast muscle fibers can adapt to aerobic metabolism by generating more mitochondria in response to
- Cross-bridges are portions of
- How would a drug that blocks acetylcholine receptors at the motor end plate affect skeletal muscle?
- Receptors for acetylcholine are located on the
- When calcium ion binds to troponin,
- In a sarcomere, thick filaments are linked laterally by proteins of the
- The thin filaments of striated muscle are made of which protein(s)?
- Which of the following statements is false?
- During activities requiring aerobic endurance
- The narrow space between the synaptic terminal and the muscle fiber is the
- Which of the following best describes the term Z line?
- At peak levels of muscle exertion the mitochondria can supply
- When a muscle is stimulated repeatedly at a high rate, the amount of tension gradually increases to a steady maximum tension. This is called