The heart and lungs

How many barrels would the heart pump in lifetime?

• 1.5 million

• 20 million

• 10 million

• 50 million

The heart doesn't do the most physical work of any muscle.

• True

• Maybe

• Maybe not

• False

How early does the first blood cell start to pump?

• 2 weeks

• 1 day

• 10 hours

• 4 weeks

Does a woman's heart typically beat faster than a man's?

• True

• Maybe

• Maybe not

• False

Lungs are the only organ that can float on water.

• True

• Maybe

• Maybe not

• False

Answer explanation

Each of your lungs contains about 300 million balloon like structures called alveoli which replace the carbon-dioxide in your blood with oxygen. When these balloons are filled with air the lungs become the only organs in the body that can float.

How many liters of air does a average human breath in a day?

• 10

• 11,000

• 300

• 1,000,000,000,000

Movement in you chest is not a result of air going in or out.

• True

• False

Answer explanation

When you breathe in our chest swells when you breathe out our chest collapses. But these chest movements are not actually the result of air filling up or exiting the lungs. During when you breath in the diaphragm (a thin sheet of dome-shaped muscle that separates the chest and abdominal cavities) contracts and moves down, increasing the space in the chest. At the same time, the muscles between the ribs expand to pull the rib cage upward and outward.

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