muscle intro

Which fiber type is most resistant to fatigue?

• Fast twitch fibers

• Slow twitch fibers

• Intermediate fibers

• Super fast twitch fibers

Draw a sarcomere showing the Z-disc, actin, and myosin. (give it your best shot!)

Answer explanation

What is a motor unit?

• One motor neuron and the all the muscle fibers it innervates.

• All fibers of the same type in a single muscle.

• The area of the brain that sends motor signals to the muscles.

• The fibers required to produce a single twitch.

Which molecule is necessary to expose the binding sites on actin and is stored in the sarcoplasmic reticulum?

• ATP

• Acetylcholine

• Potassium

• Calcium