The heart pumps through the blood . the blood carries food and a gas called in one direction. it takes food, cells and the gas in another direction ​

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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