Skeletal Muscle Tissue & Contraction

Which of the following is the correct order from largest to smallest?

• fascicle, muscle fiber, myofibril, sarcomere, myofilament

• muscle fiber, fascicle, sarcomere, myofibril, myofilament

• sarcomere, muscle fiber, fascicle, myofibril, myofilament

• fascicle, muscle fiber, myofilament, myofibril, sarcomer

The __ zone of a sarcomere contains no actin filaments while the skeletal muscle is at rest.

• H

• Z

• synaptic cleft

• sarcomere

What is the small gap that exists between the motor neuron and the muscle fiber it innervates?

• H

• Z

• synaptic cleft

• sarcomere

What are tiny contractile units that extend from Z line to Z line?

• H

• Z

• synaptic cleft

• sarcomere

What is the plasma membrane of a muscle cell?

• sarcolemma

• sarcoplasmic reticulum

• thick filament

• thin filament

What is the specialized smooth endoplasmic reticulum that is found in myofibers?

• sarcolemma

• sarcoplasmic reticulum

• thick filament

• thin filament

What is the function of Calcium (Ca+) during a skeletal muscle contraction?

• connecting to H zone

• connecting to troponin

• connecting to myofibril

• connecting to myosin

Which ion below IS NOT critical to muscle contraction?

• Sodium Ion

• Calcium Ion

• Phosphorus Ion

A mitochondria's role in muscle contraction is...

• Synthesis of ATP though phosphorylation of ADP

• Metabolism/break down of ATP

• Synthesis of Proteins

• Metabolism of Worn out Proteins

Tags

NGSS.HS-LS2-3

Which is more true about muscle contraction?

• Actin Pulls on the myosin

• Myosin Pulls on the Troponin

• Myosin Pulls on Actin

• Actin Pulls on tropomyosin