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Muscle Physiology (Grades 11-12)

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Muscle Physiology

The "all-or-none" law refers to the observation that an action potential
  1. will diminish to near zero when transmitted down a long axon.
  2. is conducted more rapidly down the axon as it reaches the axon terminal.
  3. is produced whenever the membrane potential reaches threshold.
  4. fires at the same rate regardless of the inputs to the neuron.
  5. travels only in one direction.
An overlap of actin and myosin filaments occurs in the
  1. A band.
  2. I band.
  3. Z line.
  4. H band.
What muscles may be close to parallel in the center of the muscle but converge to a tendon at one or both ends?
  1. circular muscles
  2. fusiform muscles
  3. convergent muscles
  4. pennate muscles
What is the plasma membrane of a muscle fiber?
  1. sarcoplasm
  2. sarcolemma
  3. sarcomere
  4. sarcoplasmic reticulum
What is the area of a sarcomere where the Z disk resides and the ends of the thin filaments do not overlap with the thick ones?
  1. I band
  2. A band
  3. H zone
  4. M line
What four different kinds of proteins make up myofilaments?

During a muscle contraction, the release of calcium causes the formation of                                  between the myofilaments.
What occurs during a muscle contraction?
  1. The H zones remain the same length.
  2. The A bands get wider.
  3. The M lines get closer together.
  4. The I bands trade places with the A bands.
Your little brother is sitting with his legs crossed while watching TV. He sits like that for a couple of hours. When your mom calls him for dinner, he experiences much pain as he tries to uncross his legs. Which condition is your brother experiencing?
  1. rigor mortis
  2. contracture
  3. phosphorylation
  4. oxygen debt
What primary events occur at the molecular level during a muscle contraction?

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