> For the complete documentation index, see [llms.txt](https://ss3d.gitbook.io/design/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ss3d.gitbook.io/design/entities/health/body-systems/body-parts-volume.md).

# Body parts volume

This data is useful as it gives us some rough rough idea about things such as the volume of blood in a given body part, if we make the simple approximation that blood quantity is homogeneous in the body (obviously untrue, but good enough for SS3D).

* Average volume of a human body : 65 L\
  <https://bionumbers.hms.harvard.edu/bionumber.aspx?s=n&v=3&id=109718>
* Volume of intestines :\
  <https://bionumbers.hms.harvard.edu/bionumber.aspx?s=n&v=2&id=111759>
* Volume of Heart, lungs and liver :\
  <https://bionumbers.hms.harvard.edu/files/Mass%20and%20volume%20of%20the%20organs%20of%20the%20human%20body.pdf>
* Volume of stomach :\
  <https://en.wikipedia.org/wiki/Stomach>
* Volume of limbs :

  <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2769678/>

Using those sources, we can approximate the volume for each body part :

For the torso and its organs :

* Total Torso = 50 % of 65L = 32.5L
* Heart = 0.3 L
* Lower and upper Intestines = 1 L each
* Liver = 1.5L
* Lungs = 0.7L each
* Stomach = 2L
* Total volume of Torso without organs = 32.5 - 0.3 - 1 - 1 - 1.5 - 0.7\*2 - 2 = 25.3 L

For the limbs :

* left/right arm = 4% of 65 L = 2.6L
* left/right hand = 1% of 65 L = 0.65L
* left/right leg = 14% of 65 L = 9.1L
* left/right foot = 2% of 65 L = 1.3L

For the head and its organs :

* total head = 8% of 65L = 5.2L
* Brain = 1.3L
* Eyes = 0.03 L each
* head without organs = 5.2 -1.3 - 0.06 = 3.8L


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