How long are the body's blood vessels, connected end to end?

  • 9 Replies
  • 16532 Views

0 Members and 1 Guest are viewing this topic.

*

Offline chris

  • Neilep Level Member
  • ******
  • 5424
  • The Naked Scientist
    • View Profile
    • The Naked Scientists
If all of the blood vessels in a human were strung out end to end, what distance would they span?

Chris
I never forget a face, but in your case I'll make an exception - Groucho Marx

*

Offline Geezer

  • Neilep Level Member
  • ******
  • 8328
  • "Vive la rÚsistance!"
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #1 on: 30/12/2009 17:07:08 »
Und vie vould you like to know zis, Herr Doktor Frankenstein?
« Last Edit: 30/12/2009 19:50:36 by Geezer »
There ain'ta no sanity clause, and there ain'ta no centrifugal force Šther.

*

Offline Variola

  • Neilep Level Member
  • ******
  • 1063
  • Everyone should beware of The Pox...
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #2 on: 30/12/2009 18:36:45 »
Und vie vould you like to know zis, Herr Doctor Frankenstein?

His had mislaid his medical textbook from undergrad days?? :-)

Answer is about 60,000 miles I think,although the number varies from book to book.
  A potty-mouthed, impertinent female who thinks she is God's gift to men" -JimBob

*

Offline Geezer

  • Neilep Level Member
  • ******
  • 8328
  • "Vive la rÚsistance!"
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #3 on: 30/12/2009 18:46:19 »

Answer is about 60,000 miles I think,although the number varies from book to book.
 

Blimey! That's enough to circumcise the globe more than two times.
There ain'ta no sanity clause, and there ain'ta no centrifugal force Šther.

*

Offline Variola

  • Neilep Level Member
  • ******
  • 1063
  • Everyone should beware of The Pox...
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #4 on: 30/12/2009 19:15:44 »

Answer is about 60,000 miles I think,although the number varies from book to book.
 
Yup.

These questions Chris asks always seems to end up with me answering them.... quite boring for others I should imagine.
Mind you they are useful for revision....if he could structure them round infection and disease for this term I'd be grateful... lol


Blimey! That's enough to circumcise the globe more than two times.

Yup.

These questions Chris asks always seems to end up with me answering them.... quite boring for others I should imagine.
Mind you they are useful for revision....if he could structure them round infection and disease for this term I'd be grateful... lol
  A potty-mouthed, impertinent female who thinks she is God's gift to men" -JimBob

*

Offline RD

  • Neilep Level Member
  • ******
  • 8185
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #5 on: 31/12/2009 00:26:48 »
It  should be possible to calculate an upper limit for this figure...

Imagine the entire blood volume was all contained in the smallest type of blood vessel (capillary),
 how long would that vessel have to be ?

Volume of blood in adult human  http://en.wikipedia.org/wiki/Blood_volume  4.7 -5 litres

Diameter of capillary  http://en.wikipedia.org/wiki/Capillary  5-10 μm

We're going for the upper limit so lets use 5μm and 5litres.

Volume of a cylinder
: v = π r2 h where r=2.5μm v=5litres

=> h (or rather length) = 255 million Km. The answer has to be smaller.
« Last Edit: 31/12/2009 00:34:06 by RD »

*

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • 7709
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #6 on: 31/12/2009 01:14:40 »
Nice, I had no idea it was that long.

*

Offline chris

  • Neilep Level Member
  • ******
  • 5424
  • The Naked Scientist
    • View Profile
    • The Naked Scientists
How long are the body's blood vessels, connected end to end?
« Reply #7 on: 31/12/2009 01:29:21 »
That's what my girlfriend said...
I never forget a face, but in your case I'll make an exception - Groucho Marx

*

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • 7709
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #8 on: 31/12/2009 01:35:01 »



Hmmm...

*

Offline Variola

  • Neilep Level Member
  • ******
  • 1063
  • Everyone should beware of The Pox...
    • View Profile
How long are the body's blood vessels, connected end to end?
« Reply #9 on: 31/12/2009 09:16:37 »
It  should be possible to calculate an upper limit for this figure...

Imagine the entire blood volume was all contained in the smallest type of blood vessel (capillary),
 how long would that vessel have to be ?

Volume of blood in adult human  http://en.wikipedia.org/wiki/Blood_volume  4.7 -5 litres

Diameter of capillary  http://en.wikipedia.org/wiki/Capillary  5-10 μm

We're going for the upper limit so lets use 5μm and 5litres.

Volume of a cylinder
: v = π r2 h where r=2.5μm v=5litres

=> h (or rather length) = 255 million Km. The answer has to be smaller.

RD...you have way too much time on your hands..... [:D]
  A potty-mouthed, impertinent female who thinks she is God's gift to men" -JimBob