muscle contraction quiz

The only energy source that can be used to directly power muscle contraction is

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

The heads of the myosin myofilaments form __ when they link the thick and the thin filament together

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

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

What is the name of the thin myofilaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the thick myofilaments?

• Actin
• Myosin
• Myoglobin
• Titan

The contractile unit of a muscle is called the __________.

• Sarcolemma
• Sarcoplasmic reticulum
• Sarcoplasm
• Sarcomere

The sarcoplasmic Reticulum acts as a reservoir for what?

• acetylcholine

• Na+

• K+

• Ca+2

Which of the following types of muscle tissue is striated and used to control your voluntary muscles?

• smooth

• cardiac

• Skeletal

• gastrointestinal

Which structure is the sarcomere on the diagram above?

• A

• B

• F

• D

Which two structures block the active site on an actin filament?

• fascicle & actin

• actin & perimysium

• troponin & tropomyosin

• actin & myosin