Muscle Contraction Review

What is necessary for the myosin to release the actin?

• ATP

• Calcium

• ADP

• Sodium

What happens to the distance between Z lines when a muscle relaxes?

• increases

• decreases

The sliding filament theory explains which of the following?

• muscle extensions

• muscle inductions

• muscle contractions

• muscle formation

______ and ______ work together to allow muscles to contract.

• ATP, Calcium

• smooth muscle, cardiac muscle

• Electrolytes, Phosphorous

• hemoglobin, plasma

Tags

NGSS.HS-LS1-7

What are thick filaments?

• Actin

• Myosin

• Troponin

• Tropomyosin

The act of the myosin pulling the actin in a muscle contraction is called a ____.

• cross bridge

• power stroke

• action potential

• tendon

___ and ___ are regulatory proteins bound to actin. 

• Troponin and tropomyosin
• Myosin and actin
• Calcium and Oxygen
• Glycogen and hemoglobin

The contractile unit of a muscle:

• sarcomere

• motor unit

• fascicle

• myofibril

Calcium:

• causes ATP binding to actin

• increases the action potential along the sarcolemma

• binds to proteins on myosin

• triggers the binding of myosin to actin

What is a crossbridge?

• Where myosin binds to actin

• Where the calcium crosses into the cytoplasm

• Where calcium binds with troponin

• None of the answers are correct.