Muscle Contraction and Neuromuscular Junction Review

What are the two main filaments involved in muscle contraction?

• Actin and myosin

• Collagen and elastin

• Keratin and fibrin

• Tubulin and dynein

What happens to the Z-lines during muscle contraction?

• They move apart

• They get closer together

• They disappear

• They become thicker

What happens to the sarcomere during muscle contraction?

• It elongates

• It shortens

• It remains unchanged

• It thickens

What is the source of energy for muscle contraction?

• Glucose

• ATP

• Oxygen

• Fatty acids

Tags

NGSS.HS-LS1-7

What is the role of calcium ions in the muscle contraction process shown in the diagram?

• To provide energy

• To bind to troponin

• To break down ATP

• To release ADP

Which protein does the myosin head bind to during muscle contraction?

• Troponin

• Tropomyosin

• Actin

• Myoglobin

What is released from the myosin head after the power stroke (flex)?

• ATP

• ADP and phosphate

• Calcium

• Glucose

Which molecule is responsible for the detachment (release) of the myosin head from actin after the power stroke?

• ADP

• ATP

• Calcium

• Phosphate

Which filament pulls on the thinner filament during muscle contraction?

• Myosin

• Actin

• Sarcomere

• Calcium

What is the thinner filament that is pulled during muscle contraction?

• Myosin

• Actin

• ATP

• Calcium