Muscular System

What is the name of the thick filament that plays a role in muscle contraction?

• Actin

• Sarcomere

• Myosin

• Myofibril

What is the name of the thin filament that plays a role in muscle contraction?

• Actin

• Sarcomere

• Myosin

• Myofibril

When muscles contract they:

• Shorten

• Elongate

• Stretch

• Pull

True or False. Muscles help maintain constant body temperature.

• True

• False

Tags

NGSS.HS-LS1-3

What is the layer of fibrous tissue that separates muscles from each other and from the skin.

• Sarcolemma

• Tendons

• Cartilage

• Fascia

What is the name of the specialized plasma membrane of the muscle?

• Sarcolemma

• Myofibril

• Sarcoplasmic reticulum

• Sarcomere

Which of the following are NOT bands of the myofibril? Check all that apply.

• Light band

• Red band

• I band

• Z band

• Dark band

What is the contractile unit of a muscle fiber called?

• Sarcolemma

• Myofibril

• Sarcoplasmic reticulum

• Sarcomere

___________ filaments have heads that can grab onto _________ forming a crossbridge.

• Actin, Myosin

• Myosin, Actin

True or False. Muscles must be stimulated by a nerve (motor neuron) to contract.

• True

• False