Sarcomere Structure and Function

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/disc

• M Line

• H Line

• A Line

The part of the sarcomere that B (Orange) 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 zone/band of the sarcomere is represented by yellow.

• I Zone/Band
• A Zone/Band
• H Zone/Band
• M Zone/Band

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 state is the sarcomere in #3

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

What happens to the H zone during a sarcomere contraction?

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