Skeletal muscles always work in _____

This type of muscle is only found in your heart.

When your heart _________ it squeezes blood out of the heart. When your heart _________ it fills with more blood.

Which of the following actions is an example of skeletal muscle movement? Select all that apply.

Which type of muscles are involuntary? Select all that apply.

Which type of muscles are voluntary?

What is an example of a body part that contains involuntary muscle? Select all that apply.

Which of the following actions is an example of smooth muscle movement? Select all that apply.

What is an example of a body part that contains voluntary muscle? Select all that apply.

When you run the mile, your _______ system helps bring in oxygen into your body and expels carbon dioxide.

During the mile your __________ system transports oxygen and nutrients to all your body's cells.

Your _________ system helps move your arms and legs so you can run.

After the mile, you eat a protein bar which your _________ system breaks down for nutrients.