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Biomedical subjects

M B Berkinblit

Publications and source records attributed to M B Berkinblit.

At least 37 records · Page 2Linked to original sources
PubMedDate not supplied

[Study on the Noble model of the synchronization of spontaneously active myocardial cells connected by highly permeable contacts].

Synchronization of two cells differing in sodium permeability has been studied. More frequent contractions of myocardial cells under synchronization described in [3], when the frequency of simultaneous excitation of cells is higher than that of each of them before the contact, can be explained by the electrical properties of the membranes of myocardial cells.

Action Potentials↗
PubMedDate not supplied

[Study using the Noble model of excitation propagation through a branching node].

Excitation propagation through a branching node with 3 thin branches fused into a thick one has been studied on Noble model. When the ratio of the diameters of thin and thick branches equals 1 : 10 the propagation is blocked. When the diameter ratio is 1 : 8 and excitation comes asynchroneously (along one of input branches 10 msec later than along two others) a 30 msec delay of propagation is observed. The importance of the results obtained for explaining atrio-ventricular delay is discussed.

Atrioventricular Node↗
PubMedDate not supplied

[A model of control of the movement of the multiarticular extremity].

A model for coordinated execution of multijoint goal-directed limb movements is suggested from the following principles. (1) Central control signals for a single limb joint are individually formed, proceeding from its ability to bring the limb nearer to the target and leaving control signals directed simultaneously to other joint out of account. The joints thereby behave as a set of Tsetlin's abstract automata [11], each functioning independently and guided by a common, collective effect. (2) Neither levels of muscle activation, nor force and kinematic variables are directly specified by the command signals. They only modify the system's parameters that affect equilibrium joint positions, and thus make the limb to move to the goal. A concrete model based on the above principles is described and its behavior is compared with actual goal-directed movements in man and spinal frogs. Various control strategies for multiarticular movements in living organisms are discussed.

Animals↗