Muscle Anatomy

A sarcomere is

• A protein filament or fiber
• The basic contractile unit of muscle contraction
• An organelle
• An organ

The part of the sarcomere that A (green) refers to is the?

• Z Line
• M Line
• H Line
• A Line

The part of the sarcomere that C (Blue) refers to is the?

• Actin
• Myosin
• Troponin
• Tropomyosin

The part of the sarcomere that D (Red) refers to is the?

• Actin
• Myosin
• Troponin
• Tropomyosin

What state is the sarcomere in #1

• Relaxed
• Contracting
• Fully Contracted
• None of the above

What state is the sarcomere in #2

• Relaxed
• Contracting
• Fully Contracted
• None of the above

What happens to the Z lines during a sarcomere contraction?

• It disappears
• gets closer together
• It gets bigger
• None of these

The epimysium covers

• the entire muscle

• the fascicle

• the muscle fiber

• the myofibril

Which connective tissue surrounds the fascicle?

• epimysium

• perimysium

• sarcolemma

• endomysium

What is another name for #9 (cell membrane)?

• Sarcomere

• Sarcolemma

• Myofibril

• Myofiber