What body system provides the pulling force when Niko lifts a basket?

Lea chooses to kick a ball. What type of muscle carries out this action?

Food travels through the stomach as its walls squeeze. What type of muscle does this?

Name the muscle type that keeps blood pumping without conscious effort.

What happens to an arm muscle as it contracts to lift a load?

What happens to an arm muscle's pulling force as it relaxes?

What term describes actions you choose, such as waving to a friend?

Where does most extra body heat come from during exercise?

What is the term for how you hold your body while sitting or standing?

How do muscles A and B work together to bend and straighten the arm?

What organ is protected by the structure marked A on the skeleton diagram?

What organs are protected by the chest's bony cage?

What delicate structure is protected inside the backbone?

What main job do bones perform when Jessa stands upright?

How do bones help a person walk?

Which part inside a bone produces blood cells?

What two minerals make up most of the mineral content in bones?

How is the backbone built?

How are bones in the head, chest, and backbone grouped?

What benefit does regular exercise provide for bones and muscles?