Hbs 4.2

Muscles are attached to bones by _____.

• Ligaments

• Tendons

• Cartilage

• Axons

Contractile unit of a muscle.

• sarcomere

• motor unit

• fascicle

• myofibril

Thick filaments are in a myofibril are

• ATPase

• Sarcoplasmic reticulum

• Actin

• Myosin

Thin filaments in a myofibril are

• Sarcomeres

• Sarcoplasm

• Actin

• Myosin

Calcium:

• causes ATP binding to actin

• increases the action potential along the sarcolemma

• binds to proteins on myosin

• triggers the binding of myosin to actin

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.

The energy needed to perform a muscle contraction comes directly from

• ATP

• Oxygen

• Glucose

• Calcium

Tags

NGSS.HS-LS1-7

Calcium binds to ___of the troponin-tropomyosin complex.

• troponin

• tropomyosin

• actin

• myosin

What is the structure that stores the Calcium in the muscle cell.

• Sarcoplasm

• Sarcolemma

• Myoglobin

• Sarcoplasmic Reticulum

Which is voluntary?

• cardiac

• skeletal

• smooth