Muscle Function and Contraction

Which of the following is the correct order?

• fascicle, muscle fiber, myofibril, sarcomere, myofilament
• muscle fiber, fascicle, sarcomere, myofibril, myofilament
• sarcomere, muscle fiber, fascicle, myofibril, myofilament
• fascicle, muscle fiber, myofilament, myofibril, sarcomer

Tags

NGSS.HS-LS1-2

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

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

Tags

NGSS.HS-LS1-7

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

what is the function of Calcium during a skeletal muscle contraction?

• connecting to H zone
• connecting to troponin
• connecting to myofibril
• connecting to myosin

What causes the force of the contraction?

• acetylcholine
• myosin moving 
• Calcium
• actin moving

Myofibrils are composed primarily of

• Actin and Myosin

• ATP and ADP

• Troponin

• Tropomyosin

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

Movement is enabled by muscle

• contraction
• atrophy
• subduction
• torpor

The all-or-none response means

• all of the muscles in a region contract together

• all of the muscle fibers within a muscle contract together

• when a muscle fiber contracts, it contracts completely

• when a muscle fiber contracts, all of its ATP is changed to ADP

Involuntary action is unique feature of

• Skeletal muscle

• Smooth muscle

• Cardiac muscle

• None