Muscle Review

The contractile unit of a muscle is called the __________.

• Sarcolemma
• Sarcoplasmic reticulum
• Sarcoplasm
• Sarcomere

What is the name of the thick myofilaments?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the thin myofilaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

Number 3 represents which of the following events

• action potential reaches the axon terminal
• sodium rushes into the muscle fiber
• potassium leaving the muscle fiber
• ACh crossing the synaptic cleft

Contractions are generated by

• shortening of thick filaments
• shortening of thin filaments
• sliding of thin filaments past thick filaments
• "accordian-like" folding of thick and thin filaments

What type of muscle can be found in the heart?

• Smooth
• Skeletal
• Cardiac

Smooth muscle can be found in the:

• Intestines
• 
  Heart

  Heart

• Bicep
• Brain

A motor neuron and the muscle cells it stimulates is called a:

• Sarcomere
• Neuromuscular Junction
• Motor Neuron
• Motor Unit

A marathon runner uses mostly:

• Fast twitch fibers
• Slow twitch fibers

A sarcomere spans from____________

• A line to A line
• Z line to Z line
• I band to I band
• H zone to H zone