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By Murray Bourne, 17 Feb 2009

Our bodies are quite remarkable.

## Blood, Sweat and Tears

We have around 42 billion blood vessels and if we were to put them all end-to-end, it would stretch about 160,000 km (4 times around the Earth's equator, or almost half way to the moon).

The heart pumps around 8,000 liters (800 buckets) of blood each day and 219 ML (megaliters) during a lifetime (around 88 Olympic swimming pools).

We excrete 14,200 liters of sweat (or around 1,400 buckets' worth), but I imagine this will vary depending on your climate and lifestyle.

Most of us will cry 68 liters of tears (7 buckets) and I imagine there will be gender differences with this statistic.

## Scaffolding

We are constantly replacing our bones and will produce the equivalent of 12 skeletons of new bone during a lifetime.

## Length of our DNA

Our DNA would stretch to the moon and back 8000 times.

The total length of DNA present in one adult human is calculated as:

(length of 1 base pair) × (number of base pairs per cell) ×(number of cells in the body)

= (3.4 × 10-10 m)(6 × 109)(1013)

= 2.0 × 1013 meters

That is the equivalent of nearly 70 trips from the earth to the sun and back.

2.0 × 1013 meters = 133.69 astronomical units

133.69 / 2 = 66.84 round trips to the sun

## Air

We take around 500 million breaths and inhale around 300 million liters of air during our lifetime.

## Population

There are over a quarter of a million extra people each day (almost 3 per second).

Population growth is one of the Earth's major problems, since it is a major contributor to poverty, environmental degradation and global warming. I hope some of you (especially those in countries with high population growth) will study population issues and become activists in this area.

## Learning

While in our mother's womb, we produce something like 250,000 new brain cells every minute.

We have (almost) all of the neurons we are ever going to have at birth, although the brain continues to grow until we are in our early 20s. At birth, our brain is around 12% of our body weight and it drops to 2% of our body weight by our late teens.

1. suprakash chakraborty says:

Dear Sir
Very interesting and I enjoyed the tips and knowledge received from your end.

2. hassan says:

hello!

we can only say.....oh my powerful GOD....FOR THIS raified , meticulous sytems in body....
math is all around us from high sky to space to far underearth

3. Bui Khanh Huyen says:

Dear sir,
It's very interesting but I think... . Now, there is an episode on discovery channel and I watch it, take note. I regconize that your information and the information on TV are not the same. Base on the TV, we have 40 billions blood vessel, not 42. And it would stretch about 620000 km, 2.5times around the Earth’s equator.
* My english is very bad.

4. Murray says:

Hi and thank you for your inputs.

No-one can be sure exactly about these details - they are educated guesses!

By the way, your English is fine.

5. Big ideas « thInk says:

[...] front of your mind though. No matter how many different permutations of planetary journeys I read (70 times to the sun and back/8000 return journeys to the moon/three times the distance of Pluto from the [...]

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