Bill Nye - Blood & Circulation

Question 1

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Arteries vs Veins

Answer 1

Arteries carry oxygenated blood through the body, to organs. Veins take the deoxygenated blood away.

Question 2

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Your heart is about as big as…

Answer 2

your fist.

Question 3

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Lub-dub…

Answer 3

Lub is the big push, Dub is the reloading

Question 4

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What about the relative sizes of blood vessels?

Answer 4

Blood vessels near your heart are big like highways. As the blood goes away from your heart it ends up on smaller and smaller blood vessels like streets. Every cell in your body sits next to a very small blood vessel called a capillary which are like a driveway. The cells are like houses. The blood brings nutrient and oxygen to every cell. Every cell puts waste products like carbon dioxide back into the blood stream.

Question 5

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Your feet fall asleep when…

Answer 5

Your blood vessels and nerves get squeezed.

Question 6

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Explain blood flow through the 2 sides of the heart.

Answer 6

When the right side of your heart squeezes it sends blood down to your lungs where it gets oxygen and turns red. Then it goes to the left side. When the left side squeezes it sends blood to all the other parts of your body. When it comes back it’s on the right side again.

Question 7

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What kind of blood cells do we have?

Answer 7

Red blood cells (25 trillion) and white blood cells (25 billion). For every 1000 red blood cells there is only one white blood cell.

Question 8

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Which type of blood cells are like cops in the blood stream?

Answer 8

White blood cells. They are in the arteries and veins to catch germs before they can cause an infection.

Question 9

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How many new red blood cells does your body make each day?

Answer 9

200 Billion

Question 10

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How long do blood cells live?

Answer 10

White blood cells live for two weeks. Red blood cells live for four months.

Question 11

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How much blood is in your body?

Answer 11

About 5 liters. About 5 ml are white blood cells.

Question 12

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How many times per day does your body pump your blood throughout your body?

Answer 12

100,000

Question 13

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Capillaries

Answer 13

Are very small passage ways that allow liquids to move through them. They are the vessels that connect arteries to veins. They are so small that blood cells have to travel single file through them.

Question 14

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What happens when you measure blood pressure?

Answer 14

You squeeze the veins and arteries in your arm and see how much they push back. The loudest sound is the Lub - the big squeeze. The quieter sound, the Dub, is when the heart is reloading. The top number of the blood pressure reading is the Lub. The bottom number is the Dub.

Question 15

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When your watching TV, how long does it take blood to make one complete trip through your body? When exercising?

Answer 15

30-45 seconds when watching TV.

10 seconds when you’re exercising.

Question 16

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How fast does your heart beat when you are resting? When exercising?

Answer 16

70 bpm resting. When exercising it beats faster, perhaps as much as double - 140 bpm - to keep up with your muscles oxygen demands.

Question 17

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How much does your heart weigh? How much does it pump in a day?

Answer 17

About 300g. About as much as an apple.

It pumps 7,000 liters per day.

Question 18

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What happens if you stand up fast or go in a plane and do g-force maneuvers?

Answer 18

The blood in your brain goes down into your body but does not get replaced right away. A g-suit is tight and has air bladders in the legs to help the blood go back up and pump to your brain so you can stay alert.

Question 19

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Where are blood cells made?

Answer 19

In your bones.

Question 20

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How many times will your heart beat during your lifetime?

Answer 20

About 2 billion

Question 21

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How many chambers does the heart have?

Answer 21

4

Question 22

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The heart can be strengthened by exercise because it is a…

Answer 22

muscle.