Vasopressin exerts a triggering effect upon the cells of the osmoregulating epithelium as well modulates this effect. The triggering effect is associated with the stimulation of V2-receptors in the frog bladder, whereas the modulating effect is related to the activation of the V1-receptors.
Having estimated the rat behaviour in the open-field test, M-cholinolytics were divided into different groups. Haloperidol normalised the disturbance in the behaviour induced by one group M-cholinolytics and had no effect with the other group. The former group seems to have an explicit dopaminergic activity. The groups seem to correspond to different mechanisms of the behavioural activity.
The feature of correlation between functional activity of the brain tissue and structural-functional characteristics of the vascular system after sensory deprivation by the removal of whiskers in newborn animals were studied in nembutal-anaesthetized rats in comparison to the animals under d-tubocurarine with local anesthesia. It has been shown that there are major changes of EP parameters and ECoG in the sensory-deprived brain area and diminution of brain cortex thickness. Changes in the vascular system are mainly structural, what are revealed as disorganization in angioarchitecture of radial arteries. At the same time, differences in the blood circulation intensity are found in d-tubocurarine animals only. The largest volume of the local blood circulation is observed in intact hemisphere of sensory-deprived animal. Thus, it can be concluded that sensory-deprived model is the alternative to the ischemia model. This model can be used in studies of physiology of brain blood circulation, and the "structure-function" correlation, in particular.
After 3-hr cooling stress, the activity of the erythrocytes' Na,K-ATPase was decreased by 28.9 per cent in rats, its complete restoration occurring within 24 hours after the stress. Possible reasons and factors inducing a disorder in the enzyme activity under conditions of hypothermia, are discussed.
Subjects with normal arterial pressure, those with bordering values of the AP and patients with arterial hypertension were studied. The AB, heart rate and diuresis changed independently under stress in the first group subjects, whereas these parameters depended on each other to some extent in the "future patients".
Single stimuli applied to the suprachiasmatic and supraoptic nuclei of the hypothalamus evoked short-latency hypothalamo-retinal responses which exert influences upon formation of the "a" and "b" waves of the electroretinogram, the changes of the waves being opposite by character. The effects from the suprachiasmatic and supraoptic levels were opposite, too.
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