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KMID : 0351619660070010103
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Kyungpook Medical Journal
1966 Volume.7 No. 1 p.103 ~ p.114
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Gas Exchange in Frog, Rana nigromaculata
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Abstract
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This study was aimed to obtain more detailed calculated as 31.05 ml/hi/1008 B. W. (STPD)
knowledges concerning the gas exchange through and 38.40 ml/hr/1008 B. W. (STPD) respectively,
the lung and the skin in frogs. and the over-all gas exchange ratio is 1.2.
The 0~> consumption and C0~ elimination through 3. The 0~~ uptake from the lung are increased
both the lung and the skin were determined sepa- up to 191% and C0~ elimination up to 338 %when
rately. The change in gas exchange through the the skin respiration was blocked by liquid paraf-
lung after blocking the skin respiration by imm- fin; and the corresponding increase of 0~ uptake
ersing the frog into liquid paraffin or in water and C0~ elimination are 112% and 269% respec-
was obse:ved. The blood was sampled from the lively wizen the frog was submerged into water
ventricles of frogs to determine the gas contents, completely.
gas tension and pH. The composition changes 4. The 0> and C0~> contents of ventricular blood
in gases in the peritoneal ant subcutamous gas of frogs are 3.4 vol% and 36.3vo1% respectively,
pockets were observed to estimate the tissue s,*as and 0~~ capacity of the blood is 8.72 vol% and
tension. the pH is ?. 44. The P~,,, and P,,, of the blood
The results obtained are as follows: are 16.3mmHg and 64mmHg respectively. These
1. The normal expired volume of frogs, of show that. the frog´s blood is more alkaline and
mean body weight 29 grams, is 0.42 ml/min has lower bicarbonate concentration than those
(APPS) and the inspired volume 0.43 ml/min of mammals.
(ATPS). fihe 0~ and C0~ concentration in the 5. The compositions of gases in the subcutan-
expired gas are 11.0´7% and 2.07% respectively, eous and intraperitoneal gas pockets show that
and the 0~ uptake and C0> elimination are calcu- they are approaching toward the gas tension of
rated as 7.65 ml/hr/1008 B. ~~´. (STPD) and 1.55 the blood itself.
ml/hr/1008 B. ~~´. (STPD) respectively and the 6. The main function of frog´s lung in general
gas exchange ratio of the lung is 0.2. presumably is to regulate the increased need of
2. The 0~ uptake and C0~ elimination through gas exchange during enhanced muscular activity
the skin are 23.4 ml/hr/100g B. ~´V´. (STPD) and and/or increased environmental temperature, and
36.85 ml/hr/100g B. `~~, (STPD) respectively, the decreased gas exchange thrgouh the skin
and the gas exchange ratio of the skin is 1.57, during s~vi mming in ~ water.
The over-all 0~ uptake and C0~ elimination are
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KEYWORD
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