Muscle Physiology (Grades 11-12)
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The "all-or-none law" refers to the observation that an action potential...
- will diminish to near zero when transmitted down a long axon
- is conducted more rapidly down the axon as it reaches the axon terminal
- is produced whenever the membrane potential reaches threshold
- fires at the same rate regardless of the inputs to the neuron
- travels only in one direction
An overlap of actin and myosin filaments occurs in the:
- A band
- I band
- Z line
- 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?
- circular muscles
- fusiform muscles
- convergent muscles
- pennate muscles
What is the name given to the plasma membrane of a muscle fiber?
- 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?
- the I band
- the A band
- the H zone
- 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?
- The H zones remain the same length.
- The A bands get wider in width.
- The M lines get closer together.
- 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?
- rigor mortis
- oxygen debt
What are the primary events that occur (at the molecular level) during a muscle contraction?