TABLE 1

Standard physiologic parameters for rats weighing 250 g

Organ	Mass	Q	Organ	Mass	Q
	g	ml/min		g or ml	ml/min
Lungs	1.0	43.0	Muscle	122	7.5
Brain^a^,^b	1.7	1.33	Lymph nodes^a^,^b^,^c	0.9	0.16
Heart	0.8	3.92	Liver	10.3	2.0
Stomach	1.1	1.13	Skin	40	5.83
Gut	10	7.52	Bone	15.8	2.53
Pancreas	1.3	0.52	Fat	10	0.4
Spleen	0.6	0.63	Arterial blood	5.6
Kidneys	2.3	9.23	Venous blood	11.3
Thymus^a^,^b	0.7	0.3

↵ a Fractional volume of vascular space: brain, 0.014; thymus and lymph nodes, 0.009.
↵ b Fractional volume of interstitial space: brain, 0.188; thymus and lymph nodes, 0.150.
↵ c Sum of mesenteric, axillary, inguinal, cervical, Peyer's patches, and popliteal lymph nodes.