Koštani markeri su veoma korisno dijagnostiško sredstvo, mada je njihova klinička upotreba ograničena specifičnim tehničkim i analitičkim aspektima, kao i njihovom pre-analitičkom varijabilnošću. Koštani markeri, za razliku od mineralne gustine kosti, ukazuju na posebne aspekte kvaliteta kostiju, te stoga nude zasebnu i prognostičku perspektivu u ispitivanju promena mineralne gustine kosti I smanjivanju rizika od fraktura. Smanjenje nivoa koštanih markera usko je povezano sa smanjenjem rizika od frakture vratnih pršljenova usled korišćenja raloksifena, rizedronata i alendronata. Postoje brojne mogućnosti za korišćenje ovih markera u kratkoročnom praćenju toka lečenja osteoporoze, pored merenja mineralne koštane gustine, kako bi se otkrili pacijenti koji ne reaguju na terapiju.

Cilj ovog rada bio je da utvrdi udruženost ekstrakranijalne karotidne ateroskleroze u odnosu na stranu infarkta mozga subkortikalne lokalizacije. Rad je prospektivna studija i sproveden je na grupi od 40 bolesnika. Kriterijumi za uključivanje u istraživanje je bila dijagnoza cerebrovaskularnog inzulta postavljena na osnovu kliničkog i neurološkog pregleda, te jasno potvrđena kompjuterizovanom tomografijom (CT) postojanjem infarkta mozga u subkortikalnom delu leve ili desne velikomoždane hemisfere. Podaci o ekstrakranijalnoj aterosklerotskoj karotidnoj bolesti dobijani su ultrasonografskim pregledom. Najvažniji element ultrazvučnog pregleda karotidnih arterija bio je stepenovanje stenoza i procena zadebljanja kompleksa intime i medije (IMT). Identifikovani su faktori rizika značajni za nastanak i razvoj ateroskleroze, a tome i razvoj ishemijske bolesti mozga. Na osnovu analize dobijenih rezultata infarkti mozga subkortikalne lokalizacije su češći na strani karotidne ateroskleroze bilo u formi ateromatoze unutrašnje karotidne arterije ili intimo medijalnog zadebljanja zajedničke karotidne arterije, posebno kada su udruženi sa dominantnim faktorima rizika za aterogenezu.

Koštani markeri su veoma korisno dijagnostiško sredstvo, mada je njihova klinička upotreba ograničena specifičnim tehničkim i analitičkim aspektima, kao i njihovom pre-analitičkom varijabilnošću. Koštani markeri, za razliku od mineralne gustine kosti, ukazuju na posebne aspekte kvaliteta kostiju, te stoga nude zasebnu i prognostičku perspektivu u ispitivanju promena mineralne gustine kosti I smanjivanju rizika od fraktura. Smanjenje nivoa koštanih markera usko je povezano sa smanjenjem rizika od frakture vratnih pršljenova usled korišćenja raloksifena, rizedronata i alendronata. Postoje brojne mogućnosti za korišćenje ovih markera u kratkoročnom praćenju toka lečenja osteoporoze, pored merenja mineralne koštane gustine, kako bi se otkrili pacijenti koji ne reaguju na terapiju.

Event-related potential which represents a large positive wave which varies in amplitude and depends on subject's capability as well as on stimulus modality on which subject needs to react and appears around 300 ms after stimulation is called event related potential P300. In 1965. Sutton and the assistants were the first to suggest division of evocated potentials, according to the stimulus that provoke them, on "exogenous" (under the influence of exogenous stimulus) and "endogenous" or "cognitive" provoked by endogenous stimulus, which depends on the state of consciousness (vigilance), attention, concentration and especially, the type of the task a subject needs to perform during the recording. One of the most studied responses of the event-related potentials is so called "P300", the late positive wave complex which appears around 300 500ms after the stimulus. It is gained when the subjects' attention is focused on the signal which rarely appears, especially if the signal has some emotional or motivational meaning. The aim of this work was to determine whether there was a difference in latency and amplitude of the event related potential P300 when the button is pushed with dominant hand compared with nondominant hand in both males and females. The experiment included 30 subjects (15 males and 15 females). P300 potential was provoked with the auditive "oddball" paradigm. Event-related potencial P300 is recorded with 10-20 system. Cz electrode is set in the middle of nazion-inion line, while Fz electrode is set on the third of nazion-inion line above frontal lobe. In classical "oddball" paradigm, when a subject reacted on the signal by pushing the button with dominant hand, the value of Fz end Cz latency was significantly shorter in comparison to the values of Fz end Cz latency gained by pushing the button with non-dominant hand (left hand) in males, while such differences were not found in females. 

In the study with experimental animals in vitro conditions, the aim of the research was to examine the effect of verapamil on the even brawniness of the isolated organ of the respiratory ways (tracheas) in guinea-pigs on acetylcholine and histamine, and in that way, to examine local mechanisms of smooth muscle system but also to exclude the rest of the neurohumoral influences. The guinea-pigs of both sexes (average weight of 500-700 gr), were used for this experiment. 10 guinea-pigs were included in the experimental research; the trachea was taken from them after the immolation. The preparations of isolated organs of trachea were divided into two groups (A and B). The previous incubation of trachea -5 isolated by verapamil (1 minute) in concentration 10 M significantly reduced the contraction caused by acetylcholine -4 (ascent 21.49±9.63, r=0.97, p<0.05). Concentration of verapamil 10 M also caused significant fall of contraction (ascent -5 21.3±12.63, r=0.95, p<0.05). Verapamil in concentration 10 M significantly reduces the response of isolated trachea cau- -6 -5 -4 sed by histamine in concentrations 10 M and 10 M (slope 21.3±10.6, r=0.96, p<0.05).Concentration of verapamil 10 M significantly reduced the contraction of smooth muscles of isolated trachea caused by histamine (slope 15.46±10.47, r= 0.94, p < 0.05).

Scientific researches considering the effects of glucagon on cardiovascular system show that glucagon has a certain cardiostimulative potential. The fact that glucagon accomplishes its cardiostimulative effects by activating its own, highly specific glucagonic receptors is of most importance. That's the reason why we've wanted to give more details about the effects that glucagon has on cardiovascular system in terms of having more precise image of its effects on hemodynamics and changes which can be seen on electrocardiogram. The experiment included six dogs treated with intravenous glucagon injection. Electrocardiograph and hemodynamic parameters (middle arterial pressure, central venous pressure and heart st nd rd th th th th th frequency) have been recorded in 1 , 2 , 3 , 5 , 10 , 20 , 30 and 40 minute. Electrocardiograph and heart frequency have been recorded by continuous monitoring. Middle arterial pressure has been recorded through catheter placed into a. femoralis while central venous pressure has been recorded through central venous catheter placed into v. femoralis. Having received the intravenous injection, glucagon shows extremely positive chronotropic effect, followed by ephemeral increase of middle arterial pressure, while central venous pressure has a significant decrease. Having received intravenous injection, P-R, Q-Tand T-Pinterval have been significantly shorten.

The aim of this study was registration of change in the amplitude of motor unit action potentials of m. bicepsa brachii of the dominant arm in fatigue. Investigation as coducted on 30 participants (15 male and 15 female). In the first phase of the research, 1-RM (one repetition maximum) of the dominant arm was measured. In the second phase, registration of changes in the amplitude of motor units action potentials was conducted during static contraction. Registration was performed twice, with time interval of 15 minutes. The second measurement was significantly shorter than the first. Analysis of EMNG-registration showed linear increase in MUAPamplitude in time. Significantly higher values of MUAPamplitude in the second measurements were registrated in both groups (p<0.05). Analysis of MUAPamlitude velocity change showed significantly higher values in the second measurement in males. There is no significant change in all registered values between males and females (p> 0.05).

The most important characteristic of calcium channels is a selective regulation of a slow incoming current of calcium into the tissue cells with tendency of a slow growth of the action potential. Such tissues include smooth muscles of the blood vessels, cardiocities and hearth noduses (AVand SAnode). Different calcium antagonists have different influences on the mentioned tissues, because they also have different chemical components. Verapamil, Nifedipin and Diltiazem have the most common usage. Verapamil is a product of papaverine, nifedipin is a product of dehydroperidine while diltiazem is a product of benzodiazepine. Their common characteristic is blocking the calcium channels which cause blood vessels vasodilatation, negative inotropic and negative chronotropic influence. By blocking calcium to enter through channels spores of miofibrile smooth muscles, calcium antagonists are reducing the amount of available calcium for contraction, which causes vasodilatation. One of the best-known and the commonest calcium antagonist is verapamil. In electrophysiological terms, it inhibits action potential of the heart noduses (especially AV node), where the most important thing for depolarisation, is a slow entrance of calcium. By extending the refractory period of SA node, it reduces the frequency of impulse generation (heart frequency), while by extending the refractory period of AVnode, it slows down the work of chambers in cases of flater and atrium fibrillation. Taking into consideration the fact that verapamil shows cardiodepresive effects, the aim of our work is to study closely its effects on electrocardiogram and hemodynamic parameters. The experiment was conducted on six adult, healthy dogs which were, after 10 minutes 0,9% NaCl infusion, treated with i.v. bolus verapamil injections on every 5 minutes until the appearance of intoxication signs, which causes bradycardia, heart rhythm disorder and the fall of arterial blood pressure. The average verapamil dose was 4 mg per kilogram. After i.v. verapamil administration, heart frequency and middle arterial pressure have a significant fall, while central venous pressure has a significant rise. Larger verapamil doses nd rd can significantly extend T-P and P-R interval with the appearance of AV-block (2 and 3 grade), while the Q-T interval doesn't show any significant change.

Nowdays, reaction time is most often used in data processing as a quantitative method and technique for information step and speed processing. The aim of this investigation was to examine everyday work pressure on reaction time nd among students. An examination included 30 students of 2 year of Medicine Faculty 15 males and 15 females. Audible and visual simple reaction time as well as choice reaction time for 2, 4 and 6 stimuli was used for reaction time measurement. Measurements were done three times a day. Achieved results acknowledge statistically significant improvement of reaction time at noon compared to reaction time in the morning in all samples except for visual simple reaction time for male students. For all kinds of stimuli, reaction time were significantly prolonged in the evening in both groups. Therefore, we have concluded that morning activities had positive impact on students functional condition but afternoon activities acted like an additional stress that altered students latent fatigue to clearly observable acute fatigue.

Systematic and programmed physical exercise, called training, play a significant role in human health and ability improvement. A moderate physical exercise is considered as a very efficient method of increasing general physical ability and reaching the top results in sport, and simultaneously contributes to health quality of persons having sedentary professions. In active sportspersons, ability of cardiovascular, respiratory and bone-muscle systems are determined by training quality itself. Sportspersons show characteristically better adaptability of neurohumoral system to effort, as well as a higher activity of intracellular enzyme systems. Well-dosed physical exercise has an exceptional influence on human health, above all by regulating cholesterol blood level and electrolyte level of serum, whose minimal change can directly affect human health. This study was aimed to establish quantity and quality of organism response to physical exercise, in regard to level of daily training, by determining lipid fractions level in serum and electrolyte composition of serum. The study involved 50 healthy men in age between 20 and 25, divided into two groups. The first group was composed by physically untrained men, chosen by the random sample method. The other group of subjects was composed by 35 active sportsmen, chosen by direct selection for the best-trained ones among them. In order to reach a submaximal exertion, we used Astrand's test of submaximal exertion on the bicycle-ergometer. Blood samples were taken immediately before and after testing. The following parameters were determined in blood serum: high-density lipoproteins (HDL), low-density lipoproteins (LDL), triglyceride + + 2+ 2+ - content, as well as concentration of sodium (Na ), potassium (K ), calcium (Ca ), magnesium (Mg ) and chlorine (Cl) ions. On the base of our research we concluded that physical exercise of submaximal intensity did not lead to any quantitative and qualitative change of lipid fractions in blood serum of untrained persons. Physically inactive persons had higher serum concentrations of triglycerides and total cholesterol in regard to the investigated sportsmen. At the same time, sportsmen showed a higher HDL content of serum. Physical exertion in sportsmen led to a significant rise of triglycerides and highdensity lipoproteins content of serum, and the levels of total cholesterol and low-density lipoproteins did not changed + ++ significantly. Physical exertion of submaximal intensity in both studied groups caused a significant increase of Na , Ca and ++ + - Mg ion concentration, while concentration of K and Cl ions did not changed significantly. Numerous clinical studies showed that moderate aerobe exercise amplifies endothelial function and reduces cardiovascular risk