In increasing of the ambient temperature, the difference between the brain and body temperatures diminished from 1.4 degrees C (at the ambient temperature 0 degree C) to 0.5 degrees C (at the ambient temperature +37 degrees C) in bullfinches, the brain temperature being always the lower one. In combination of high ambient temperature and locomotor activity the brain-body temperature difference increased as the body temperature had raised higher than the brain one.
Unit activity was studied in the visual cortex prior to and after amyzyl administration in monkeys trained for delayed visual differentiation of different colour stimuli. The data obtained suggests that the cholinergic mechanisms of the visual cortex are involved in the visual recognition and seem to play different functional roles at different stages of the behaviour.
A new hypothesis is suggested according to which the ulcerogenic effect of large corticosteroid doses is regarded as a consequence of suppression of hypothalamo-pituitary-adrenocortical system (HPAS) function. On the 7-th day after the administration of a large hydrocortisone dose to rats the HPAS block was observed. The HPAS block increased the area of hemorrhagic damages of the stomach mucosa induced by a stress factor. Similar data on the ulcer formation were obtained when using intrahypothalamic administration of dexamethasone. The replacement therapy decreased the effect of HPAS block in both cases. The data show that the stomach ulcer formation after the administration of high corticosteroid doses occurs as a result of endogenous hormone production insufficiency.
Chronotropic and inotropic responses of the cat heart to cooling of the nn. vagi, raising of arterial pressure, stimulation of central ends of the nn. vagi, were different under different actions but stable in their character. This makes unreliable the estimation of reflex and tonic effects on the heart on the basis of heart rate alone.
Hypoglycemia at the initial stage of the prenatal development decreased the level of glucose in the rat blood, increased glucose-6-phosphatase in the liver. Hyperglycemia increase the glucose content in the blood with relatively minor changes of the glucose-6-phosphatase activity and oxidation of hydrocarbonates.
The paper reviews the role of neural and humoral signals associated with the gastro-intestinal tract's activity, in organisation of motivational and emotional behaviour. The author rejects the idea of insignificance of the digestive channel's role in formation of the states of hunger and satiety. Conditioned readjustment of initiating and inhibitory afferents from mechano-, osmo- and chemoreceptors of the stomach and upper portions of the intestine, are shown to play a part in formation of general and specialised appetites according to the body needs.
Two-hour heat exposure (40-41 degrees C) was shown to change the circadian rhythms of enteral gamma-amylase, maltase and sucrase activities. The character and obviousness of the changes depended on the type of enzyme activity and the portion of the small intestine. The heat exposure did not change daily mean levels of enzymatic activities and their distribution along the small intestine.
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：