Sliding Filament Theory Review

Muscles are attached to bones by:

• ligaments

• cartilage

• tendons

• axons

The organelle that contains the myofilaments actin and myosin.

• tendon

• myofibril

• muscle fiber

• fiber

Contractile unit of a muscle

• sarcomere

• fascicle

• motor unit

• myofibril

Thick filaments in a myofibril are made of

• ATPase

• actin

• sarcoplasmic reticulum

• myosin

Thin filaments in a myofibril are made of

• sarcomeres

• actin

• sarcoplasm

• myosin

Calcium:

• causes ATP binding to actin

• binds to proteins on myosin

• increases the action potential along the sarcolemma

• triggers the binding of myosin to actin

What is a crossbridge?

• where myosin binds to actin

• where calcium binds to troponin

• where the calcium crosses into the cytoplasm

• none of the answers are correct

The energy needed to perform a muscle contraction comes directly from

• ATP

• glucose

• oxygen

• calcium

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Calcium binds to what part of the thin filament?

• troponin

• actin

• tropomyosin

• myosin

Calcium is stored in the

• sarcoplasm

• sarcoplasmic reticulum

• nerve cells

• myosin filament