allometry lung body

Heart and lung mass, rate of oxygen consumption (VO2), respiration rate (fR), tidal volume (VT), and heart rate (fH), were measured at rest and thermoneutrality in the shrew Crocidura russula monacha [(This shrew is claimed to be Crocidura suaveolens (Catzeflis, F., T. Maddalena, S. Hellwing and P. Vogel (1985). Unexpected findings on the taxonomic status of East Mediterranean Crocidura russula auct. (Mammalia, Insectivora). Zeitschrift fur Saugetierkunde 50: 185-201)] in nullipar (N), pregnant (P) and lactating (L) females...

During human pregnancy, there is a huge increase in the total weight of the embryo/fetus from conception to term. The total growth, which is the summation of growth of the various organs and tissues that make up the organism, was analyzed in a previous paper and fitted to the Gompertz equation for growth. In the present study, allometry, the quantitative representation of the consequence of size, was utilized to describe the correlation of individual fetal organ/tissue weights with the total fetal weight. The organ/tissue weight and the total fetal weight data used in the analyses were pooled from various sources that provided data ranging from 25 days to 300 days post-conception...

The importance of allometry as an analytic tool is well recognized in the literature of primate morphology. However, a number of recent studies have illustrated how interpretive difficulties can arise when researchers confound different types of allometric data. Such confusion is due less to carelessness than to uncertainty about how different types of allometry are related. The present study examines the relationship between two types--ontogenetic and interspecific allometry--in the case of organ weight scaling in six species of Old World monkeys...

Allometry is used as a tool to explain the apparent mismatch of oxygen consumption and diffusing capacity in the mammalian lung. By combining equations for pulmonary capillary volume and cardiac output, it is apparent that erythrocyte transit time through the lung must scale disproportionately to body mass. This inequality is a consequence of physical and mechanical properties setting optimal cardiac and respiratory frequencies. Because of much shorter transit times, the mean alveolar-capillary oxygen pressure difference increases as body size decreases...

In mammals the weight of the heart, kidney, lungs, and other organs can be related to total body weight through power laws (allometry). Weights of primate organs are analyzed by this technique. Allometric coefficients and size-independent organ-weight or body-form ratios may be used to compare primates, including humans, and other mammals.

Growth allometry was examined over the range 6 to 112 days of age in male and female mice from lines selected for low (L) or high (H) plasma concentrations of insulin-like growth factor-I (IGF-I). Plasma IGF-I concentrations were greater in the H line than in L line mice from 28 days of age. H line mice also had greater liveweights and weights of the heart, kidneys, pancreas, lungs, liver, brain and testes from 21-28 days of age. Changes in weights of these organs reflected the general pattern of body growth, there being no consistent effects of selection line on allometric growth coefficients...

The change of proportion of organ weights for the liver, intestines, lung, kidney, thymus, heart and spleen were analysed for 33 Japanese fetuses (sexes combined) by multivariate allometry. The thymus showed the highest allometric coefficient, and the spleen the next highest. The intestines, heart, liver, kidney showed medium coefficients, and the lung had the lowest.

The allometric scaling of nine internal organs was examined for Macaca arctoides. Significant organ weight-body weight regressions were obtained for heart, lungs, kidneys, pancreas, thyroid, liver, and testes. The spleen and adrenal glands exhibited strong variability and were only loosely correlated to body weight. Using allometry as a criterion of subtraction, observed sex differences in mean organ weights were seen to be primarily the result of differences in average body weight. It is postulated that analysis of observed differences in organ weights between this species and Macaca mulatta would yield similar conclusions...