Bill Nye: Blood & Circulation: G

Our bloodstream is like a river _____ km long.

• 1.000

• 10.000

• 100,000

• 1,000,000

Our bloodstreams would stretch _____ times around the Earth.

• 2

• 2½

• 3

• 3½

Our bodies use _____ to carry food, oxygen, and waste.

• blood

• plasma

• red blood cells

• white blood cells

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We have about 25 _____ red blood cells in our body.

• million

• billion

• trillion

• quadrillion

We have about 25 _____ white blood cells in our body.

• million

• billion

• trillion

• quadrillion

The ratio of red blood cells in our body to white blood cells in our body is _____.

• 100:1

• 1,000:1

• 10,000:1

• 100,000:1

When one valve in your heart is open, the other must be _____.

• closed

• perpendicular

• parallel

• open too

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Each day your body makes _____ billion red blood cells.

• 100

• 200

• 300

• 400

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White blood cells live about _____ weeks.

• 2

• 3

• 4

• 5

Red blood cells live about _____ months.

• 2

• 3

• 4

• 5