Muscle Contractions Review

What structure connects the message from the brain to a muscle?

• Motor Neuron

• Sarcomere

• Sarcoplasmic Reticulum

• Muscle Fiber

What structure stores and releases calcium ions?

• Myofybril

• Sarcomere

• Sarcoplasmic Reticulum

• ATP

Tags

NGSS.HS-LS1-3

What structure in the muscle disperses the signal out to each muscle fiber?

• Sarcomere

• Myofibril

• T-Tubules

• Sarcoplasmic Reticulum

Which myofibril is thin and light?

• Actin

• Myosin

• Myoglobin

• Hemoglobin

Which myofibril is thick and dark?

• Actin

• Myosin

• Myoglobin

• Hemoglobin

Myosin and actin physically interact when muscle is resting.

• True

• False

Which two chemicals allow myosin and actin to interact?

• ATP and Calcium

• Calcium and Sodium

• Sodium and ATP

What substance binds to myosin's "blockers?"

• Calcium Ions

• Sodium Ions

• ATP

Which substance binds directly to myosin and allows it to bind to actin?

• Calcium Ions

• Sodium Ions

• ATP

What is our current model of muscle contraction called?

• Fluid Mosaic Model

• Sliding Filament Theory

• Newton's Laws of Motion

• Big Bang Theory