Muscular System

What are the 3 types of muscle tissue?

• Skeletal

• Cardiac

• Smooth

Muscle organization levels (smallest to largest)?

• Mybrofil

• Muscle Fiber

• Fascicle

• Muscle

Connective tissues: endomysium surrounds?

Individual muscle fibers

What does perimysium surround?

Fasicles

What does epimysium surround?

The entire muscle

What proteins are involved in muscles contraction?

Actin and myosin

What role does calcium play in muscles contraction?

Binds to troponin, exposing actin for myosin to attach

What is the sarcomere?

The functional unit of a muscle fiber

What is the Z-line?

The boundary between sarcomeres

What is the M-line?

The middle of the sarcomere

What is a cross-bridge?

The myosin head attached to actin during contraction

What is the power stroke?

Myosin head pulling actin inward

What causes rigor mortis?

Lack of ATP after death, causing muscles to remain contracted

What causes muscle fatigue?

Oxygen debt and lactic acid build-up

What is the prime mover?

Main muscle responsible for a movement

What is an antagonist muscle?

Muscle that opposes the prime mover

What is the origin of a muscle?

The fixed attachment

What is the insertion of a muscle?

The movable attachment