Psycho medicine

   Excitable tissue – 03 01.   Physiological (functional) lability of the tissue. Methods for its determination. Characteristics of excitability and lability of nervous and muscular tissues. Rhythm repetition (A. A. Ukhtomski).   Lability (functional mobility) is the  ability of the excitable tissue to generate a certain number of impulses (rate)  of excitation per unit of time (Vvedensky N. E.). Its value is 500-1000 imp/sec for the nervous tissue, 200-250 imp/sec for the muscular tissue, 100-125 imp/sec for the chemical synapse. Nervous tissue has greater lability than muscle tissue . Its value depends on the functional state of the tissue. It can change in the course of a prolonged action of the stimulus, that is, the tissue can increase its lability in the process of vital activity. Rhythm assimilation is the ability of excitable tissue to change the generated number of impulses of excitations during prolonged stimulation (A. A. Ukhtomsky).   02. Parabiosis (N. E. Vvedenskiy). Tran

Excitable tissue – 02 Muscles compose up to 40% of total body mass 40%. In general, it provides a variety of motor functions. 1.       There are skeletal (voluntary movements, that are controlled by conscious effort), 2.       cardiac and 3.       smooth muscle tissues (the latter are involuntary since they are innervated by ANS). Muscle tissue functions : -           skeletal muscles (movement of the body in three dimensions, movement of parts of the body relative to each other, maintaining the posture, movement of blood and lymph, temperature regulation, pulmonary ventilation, water and salt depots, protective function; -           smooth muscles (evacuatory function, sphincter function, regulation of blood vessel tone, ligamentous apparatus); -           cardiac muscle (provides blood flow through the vessels).   Muscle fibers have a number of properties: excitability, conductivity, contractility, elasticity Muscle fibers are characterized by lesser excitability