09 - Muscle Tissue: Contraction

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

• H
• Z
• synaptic cleft
• sarcomere

when skeletal muscle is fully contracted, the __ are closer to the thick filament

• H
• Z
• synaptic cleft
• sarcomere

the only energy source that can be used to directly power muscle activity

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

the heads of the myosin myofilaments are called __ when they link the thick and the thin filament together 

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

specialized smooth endoplasmic reticulum that surrounds each myofibril, it stores calcium and releases on demand

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

myosin protein

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

actin, contractile protein

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

What causes the force of the contraction?

• acetylcholine
• myosin moving 
• Calcium
• actin moving

Which of the following occur when ATP binds to the myosin head?

• Myosin head change to low energy configuration

• Myosin head undergoes power stroke

• Myosin head detach from actin

• Myosin head forms cross bridge

Which of the following are the regulatory protein in muscle contraction? (Multiple answer)

• Sarcoplasmic reticulum

• Actin

• Troponin

• Myosin

• Tropomyosin