PHYSIOLOGICAL PROPERTIES OF SKELETAL MUSCLE
Excitability or irritability :: the property of a tissue to respond to a stimulus is called excitability if the response observed is shortening of the tissue (contraction of tissue) it is known as contractility
Summation and all or none low:: skeletal muscle fibres follow the all or none low which states that muscle fibre either contracts to its maximum ability or does not contract at all when a stimulus is given however it is seen that if the strength of the current is increased the height of contraction is also increased this is because more and more number of the motor units are stimulated or in other words there is summation of contraction of more number of motor units this type of summation is known as the multifibre summation or quantal summation a motor unit is a single nerve fibre alongwith all the muscle fibres which it supplies
Tonicity :: in the living organism muscles are never completely relaxed at rest but are partially contracted this is known as tone of the muscle muscle tone of skeletal muscles is controlled by nervous impulse reaching the muscle unconsciously from the cerebellum of the central nervous system
Refractory period :: it is generally observed that the activity of the muscular tissues is associated with a loss of excitability during which a stimulus fails to produce excitation no matter how strong is the stimulus this is known as refractory period
Serial Elastic component :: this term signifies those components of the muscle which try to damp down the sudden development of tension in a muscle it is identical to elasticity of the muscle
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