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Match the type of muscle to its action.

Which muscle group is involved in smiling and frowning?

Which of the follow structures are part of the sarcomere? Check all that apply

Check all of the different ways that paraythroid hormone increases the amount of calcium in the blood. 

This is a hypothetical (made up) example: It takes 5 motor units to lift a light box, but 25 to lift a heavy box. Which principle is being shown here?

Which of the following are functions of the muscular system. Check all that apply

What structure is shown in the image below?

Skeletal muscles are stimulated to contract by which type of neuron.

Calcium bonds to which of the structures shown in this image?

What is the graph in the image below showing?