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Muscle Physiology (Grades 11-12)

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Muscle Physiology

1. 
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
2. 
An overlap of actin and myosin filaments occurs in the:
  1. A band
  2. I band
  3. Z line
  4. H band
3. 
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
4. 
What is the name given to the plasma membrane of a muscle fiber?
  1. sarcoplasm
  2. sarcolemma
  3. sarcomere
  4. sarcoplasmic reticulum
5. 
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
6. 
What are the four different kinds of proteins that make up myofilaments?



7. 
During a muscle contraction, calcium is released that causes the formation of                                  between the myofilaments.
8. 
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
9. 
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
10. 
What are the primary events that occur (at the molecular level) during a muscle contraction?



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