The theme song has the addition of an heart monitor beeping.
The heart is a muscle, which can be made stronger through exercise.
Our hearts pump blood through arteries, veins, and capillaries all through our bodies.
To stay alive, our bodies use blood to carry our food, oxygen, and waste.
If you put all of your blood vessels in a line, they would stretch around the Earth's equator 2 1/2 times?
Some capillaries are 50 times thinner than a baby's hair?
There are four main types of blood - A, B, AB, and O?
S 5 : Ep 20
Aired 1/1/96 (23:11)
S 5 : Ep 16
(23:16)
S 5 : Ep 10
(23:06)
S 5 : Ep 7
(23:00)
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