3. Physiology
        3.2. Cardiovascular
3.2.5. Special circulations

Special circulations

Local control vs systemic control

In brain and heart, intrinsic flow-regulating mechanisms are dominant.

In skin, systemic control dominant (role in BP control AND temperature control)

In skeletal muscles

Special circulation

Summary of different circulations

Some baseline facts:

Heart

Thus,

Brain

Thus,

Kidney

Thus,

Liver

Thus,

NB:

Contribution to blood supply

Contribution to oxygen supply

Others

[KB]

Other notes

SVC vs IVC

PvO2 from IVC is normally higher (SatO2 = 77%)
* Due to low O2 extraction by kidney

PvO2 from SVC is lower (SatO2=71%)

Basal O2 consumption

Alveolar ventilation

Cardiac output and O2 consumption

% of C.O. % of VO2 Flow/
100g
VO2/
100g
Brain 15 20 50-54 3-3.5
Heart 5 10-12 ~80 10
Liver 28-30 20 60 2
Kidney 24 (20-25) 7.2 400 6
Skin 9 5
Muscles 16 20 2-4
Bone
Bowel

NB:

[WG21:p615]

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Updated20050816
Reviewed20050816


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