Structure of Myofilaments

What is the term used to describe the structure depicted in the image?

• Structure of Neurons

• Structure of Myofilaments

• Structure of DNA

• Structure of Lipids

Tags

NGSS.HS-LS1-1

What happens when a muscle contracts?

• The sarcomeres lengthen.

• The myofilaments disintegrate.

• The sarcomeres inside each muscle fiber contract.

• The muscle fiber splits into two.

What are sarcomeres made of?

• Actin and calcium.

• Myosin and lipids.

• Actin and myosin.

• Myosin and carbohydrates.

What occurs when a sarcomere contracts?

• Actin pushes myosin towards the Z-lines.

• Myosin pulls actin towards the M-lines.

• Actin and myosin repel each other.

• Myosin disassembles into actin.

Actin and myosin are both examples of what?

• Lipids

• Enzymes

• Myofilaments

• Nucleic acids

What is made of a thin filament?

• Myosin

• Actin

• Sarcomere

• Myofibril

What is the correct analogy for the structure of myosin?

• A string of pearls

• A wet noodle

• A twisted rope

• A DNA helix

What blocks myosin-binding sites when a muscle is relaxed?

• Actin

• Myosin heads

• Tropomyosin

• Troponin

Tropomyosin is made of ______ subunits.

• 2

• 3

• 4

• 5

What binds to actin and stabilizes it like a 'wet noodle'?

• Myosin heads

• Troponin

• Tropomyosin

• Regulatory proteins