How Muscles Contract

Of the 3 types of muscle, which is responsible for pumping your heart.

• Skeletal Muscle

• Cardiac Muscle

• Smooth Muscle

Cardiac muscle is a _______________ muscle.

• Voluntary

• Involuntary

Your Heart beating is an example of what kind of movement?

• Voluntary

• Involuntary

When muscles shorten

• contract

• relaxed

• sleep

• stiffen

Tags

NGSS.MS-LS1-7

The stretchy, elastic structures in the body that have the special ability to contract.

• contract

• tendons

• ligaments

• muscles

What is the primary molecule responsible for muscle contraction?

• ATP

• ADP

• NADH

• FADH2

Which ion is essential for muscle contraction to occur?

• Sodium

• Calcium

• Potassium

• Magnesium

What is the role of the sarcoplasmic reticulum in muscle contraction?

• Stores calcium ions

• Produces ATP

• Synthesizes proteins

• Transports oxygen

Which protein forms the thick filaments in muscle fibers?

• Actin

• Myosin

• Troponin

• Tropomyosin

During muscle contraction, which molecule binds to troponin to expose binding sites on actin?

• Calcium

• ATP

• ADP

• Phosphate