The specific blood flow of resting skeletal muscle is very low, since 35-45% of body mass is muscle. It increases 10-20 fold during maximal activity, increasing most in those muscles which are working. Resting myocardial flow rate is equal to that of active skeletal muscle, and may increase 4-5 fold at high cardiac work loads.
Skin specific flow rate, low at rest, can also increase many-fold, as during the cutaneous vaso- and venodilatation involved in heat-dumping. In salivary gland and gastrointestinal tract, specific blood flow increases sharply during and immediately following food ingestion.
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