What is the name of the Thick filaments?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the thin filaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the contractile unit in a muscle cell?

• fascicle
• sarcomere
• tendon
• endomysium

The plasma membrane of a skeletal muscle cell is called the:

• sarcomere
• myofilament
• sarcolemma
• sarcoplasm

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.  

• Muscle cell
• Neuron
• Gland
• None of the above

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 is a crossbridge?

• Where myosin binds to actin
• Where the calcium crosses into the cytoplasm
• Where calcium binds with troponin
• None of the answers are correct.

Another name for a muscle cell.

• Fiber
• Sacrolemma
• Sacromere
• Fascicle

The energy needed to perform a muscle contraction comes directly from

• ATP
• Oxygen
• Glucose
• Calcium

Tags

NGSS.HS-LS1-7