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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 are muscles called that 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 name given to the plasma membrane of a muscle fiber?
  1. sarcoplasm
  2. sarcolemma
  3. sarcomere
  4. sarcoplasmic reticulum
What is the name given to 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. the I band
  2. the A band
  3. the H zone
  4. the M line
What are the four different kinds of proteins that make up myofilaments?

During a muscle contraction, calcium is released that causes the formation of                                  between the myofilaments.
Which of these occurs during a muscle contraction?
  1. The H zones remain the same length.
  2. The A bands get wider in width.
  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 and when your mom calls him for dinner, he experiences much pair as he tries to uncross his legs. Which condition is your brother experiencing?
  1. rigor mortis
  2. contracture
  3. phosphorylation
  4. oxygen debt
What are the primary events that occur (at the molecular level) during a muscle contraction?

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