EXIT TIX-sarcomere anatomy

What is the area labeled 8

• M line

• Z line

• H zone

• A band

What is the area labeled 1

• A band

• Myofibril

• Sarcomere

• H zone

What is the area labeled E?

• M line

• A band

• I band

• Z line

What happens to the H zone during a contraction?

• It grows larger

• It disappears

• It stays the same length

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

What state is the sarcomere in #1

• 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

Thin filaments in a myofibril are

• Sarcomeres
• Sarcoplasm
• Actin
• Myosin

Thick filaments are in a myofibril are

• ATPase
• Sarcoplasmic reticulum
• Actin
• Myosin