Concept 3.3 Lecture Video and Quiz

What is the primary function of the muscular system?

• Stabilizing joints

• Maintaining posture

• Generating heat

• Movement

Where is the insertion point of a muscle?

• On a tendon

• On an immovable bone

• On a movable bone

• On a joint

Which muscle acts as the prime mover in a bicep curl?

• Triceps brachii

• Brachioradialis

• Biceps brachii

• Brachialis

What is the role of an antagonist muscle?

• To assist the prime mover

• To oppose or reverse a movement

• To stabilize a joint

• To generate heat

Which type of muscle tissue is striated and contracts involuntarily?

• Skeletal muscle

• Cardiac muscle

• Connective tissue

• Smooth muscle

What is the main characteristic of skeletal muscle tissue?

• Striated and involuntary

• Striated and voluntary

• Non-striated and involuntary

• Non-striated and voluntary

What are myofibrils composed of?

• Sarcoplasm

• Nuclei

• Mitochondria

• Myofilaments

What is the contractile unit of a muscle called?

• Myofibril

• Sarcomere

• Actin

• Myosin

Which connective tissue wraps around each muscle fiber?

• Sarcolemma

• Endomysium

• Perimysium

• Epimysium

What is the sliding filament model?

• A model showing the structure of muscle fibers

• A model explaining the role of ATP in muscle contraction

• A model describing how muscles contract by sliding past each other

• A model explaining how muscles generate heat