Exploring the Muscular System: Types and Functions of Muscle

Mr. Andersen discusses the muscular system, highlighting different muscle types: skeletal, smooth, and cardiac. He explains muscle structure, focusing on sarcomeres and the interaction between actin and myosin. The sliding filament theory is detailed, describing how muscles contract and relax through the movement of actin and myosin, powered by ATP and calcium.

Who was mentioned as the world's strongest man in the 1950s?

• Paul Andersen

• Arnold Schwarzenegger

• Ronnie Coleman

• Lou Ferrigno

What type of muscle is responsible for endurance activities?

• Fast twitch muscles

• Smooth muscles

• Cardiac muscles

• Slow twitch muscles

Which type of muscle is involuntary and found in the digestive system?

• Cardiac muscle

• Skeletal muscle

• Fast twitch muscle

• Smooth muscle

What is the basic unit of a muscle called?

• Myofibril

• Actin

• Sarcomere

• Tendon

Which two molecules are essential for muscle contraction?

• Actin and Tropomyosin

• Actin and Myosin

• ATP and Calcium

• Tropomyosin and Myosin

What role does calcium play in muscle contraction?

• Provides energy

• Attaches to actin

• Blocks myosin

• Removes tropomyosin block

What happens to myosin when calcium is present?

• It releases ATP

• It grabs onto actin

• It blocks tropomyosin

• It detaches from actin

What is the sliding filament theory?

• Theory explaining muscle relaxation

• Theory explaining muscle contraction

• Theory explaining calcium release

• Theory explaining ATP production

What happens to the Z disks during muscle contraction?

• They move closer together

• They stay in the same position

• They disappear

• They move further apart

What is required for myosin heads to pull actin?

• Neither ATP nor calcium

• Only ATP

• Only calcium

• Both ATP and calcium