Skeletal Muscle Contraction Physiology

Which organelle in the muscle fiber will increase or decrease depending on muscle use?

• golgi apparatus

• myofibril

• sarcolemma

• ribosomes

Which characteristic of muscle tissue describes its ability to stretch without being damaged?

• Extensibility

• Elasticity

• Excitability

• Contractility

Myoglobin ______.

• is a protein involved in making ADP.

• breaks down glycogen.

• stores oxygen in muscle fibers.

• is found in the plasma membrane of muslce fibers.

What structure in skeletal muscle cells functions in calcium storage?

• tropomyosin

• mitochondria

• sarcoplasmic reticulum

• sarcolemma

During contraction coupling/sliding filament of a muscle contraction, ATP is used 3 times.  Identify when ATP is used.

• Energize myosin heads.

• Release calcium out of the sarcoplasmic reticulum.

• Move calcium ions back into sarcoplasmic reticulum.

• Attach myosin tails to the troponin.

• Detach myosin from the actin.

Which following statements accurately explain the phenomenon of muscle fatigue?

(Choose all that apply)

• T-tubules no longer transmitting action potential.

• Ionic disturbances interfering with calcium release from the sarcoplasmic reticulum (SR).

• Lactic acid build up in muscles causing extreme pain.

• Muscle has used most of its available energy.

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Which statement describes a Motor Unit?

• A motor neuron and all the muscle fibers it stimulates.

• The ability of a muscle to return to its original length after being stretched.

• The 3 parts of the neuromuscular junction.

• This is another name for a skeletal muscle fiber.

When muscles contract, the thin filaments slide past the thick filaments. What are the names of the thin and thick filaments?

• Tropomyosin and Myosin

• Actin and Myosin

• Troponin and Tropomyosin

• Tropomyosin and Actin

Name the neurotransmitter used at the Neuromuscular Junction.

Identify the three processes where we get the energy to run our muscles?

• Aerobic respiration

• oxygen

• Anaerobic respiration (Glycogen-Lactic Acid system)

• Phosphagen System (substrate level phosphorylation)

• Saltatory Conduction

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